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Investment Securities (Fair Value Measurement by Level) (Details) (USD $) | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Debt securities issued by corporations | Dec. 31, 2012 Debt securities issued by corporations | Dec. 31, 2013 Discontinued Operations | Dec. 31, 2012 Discontinued Operations | Dec. 31, 2011 Discontinued Operations | Dec. 31, 2013 Fair value | Dec. 31, 2012 Fair value | Dec. 31, 2011 Fair value | Dec. 31, 2013 Fair value Mortgage-backed and asset-backed securities | Dec. 31, 2012 Fair value Mortgage-backed and asset-backed securities | Dec. 31, 2013 Level 1 | Dec. 31, 2012 Level 1 | Dec. 31, 2011 Level 1 | Dec. 31, 2013 Level 2 | Dec. 31, 2012 Level 2 | Dec. 31, 2011 Level 2 | Dec. 31, 2013 Level 2 Mortgage-backed and asset-backed securities | Dec. 31, 2012 Level 2 Mortgage-backed and asset-backed securities | Dec. 31, 2013 Level 3 Mortgage-backed and asset-backed securities | Dec. 31, 2012 Level 3 Mortgage-backed and asset-backed securities | Dec. 31, 2013 Level 3 Fixed maturity investments | Dec. 31, 2012 Level 3 Fixed maturity investments | Dec. 31, 2011 Level 3 Fixed maturity investments | Dec. 31, 2013 Level 3 Common equity securities | Dec. 31, 2012 Level 3 Common equity securities | Dec. 31, 2011 Level 3 Common equity securities | Dec. 31, 2013 Level 3 Convertible fixed maturity investments | Dec. 31, 2012 Level 3 Convertible fixed maturity investments | Dec. 31, 2011 Level 3 Convertible fixed maturity investments | Dec. 31, 2013 Level 3 Other long-term investments | Dec. 31, 2012 Level 3 Other long-term investments | Dec. 31, 2011 Level 3 Other long-term investments | Dec. 31, 2013 Fair value measured on a recurring basis Fair value | Dec. 31, 2012 Fair value measured on a recurring basis Fair value | Dec. 31, 2013 Fair value measured on a recurring basis Fair value US Government and agency obligations | Dec. 31, 2012 Fair value measured on a recurring basis Fair value US Government and agency obligations | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Debt securities issued by corporations | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Debt securities issued by corporations | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Debt securities issued by corporations Financials | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Debt securities issued by corporations Financials | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Debt securities issued by corporations Consumer | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Debt securities issued by corporations Consumer | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Debt securities issued by corporations Industrial | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Debt securities issued by corporations Industrial | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Debt securities issued by corporations Communications | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Debt securities issued by corporations Communications | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Debt securities issued by corporations Utilities | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Debt securities issued by corporations Utilities | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Debt securities issued by corporations Energy | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Debt securities issued by corporations Energy | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Debt securities issued by corporations Basic Materials | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Debt securities issued by corporations Basic Materials | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Debt securities issued by corporations Technology | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Debt securities issued by corporations Technology | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Debt securities issued by corporations Other | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Debt securities issued by corporations Other | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Mortgage-backed and asset-backed securities | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Mortgage-backed and asset-backed securities | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Foreign government, agency and provincial obligations | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Foreign government, agency and provincial obligations | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Preferred stocks | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Preferred stocks | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Municipal obligations | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Municipal obligations | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Fixed maturity investments | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Fixed maturity investments | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Short-term investments | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Short-term investments | Dec. 31, 2011 Fair value measured on a recurring basis Fair value Short-term investments | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Common equity securities Financials | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Common equity securities Consumer | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Common equity securities Consumer | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Common equity securities Industrial | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Common equity securities Industrial | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Common equity securities Communications | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Common equity securities Communications | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Common equity securities Utilities | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Common equity securities Utilities | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Common equity securities Energy | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Common equity securities Energy | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Common equity securities Basic Materials | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Common equity securities Basic Materials | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Common equity securities Technology | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Common equity securities Technology | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Common equity securities Other | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Common equity securities Other | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Common equity securities | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Common equity securities | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Convertible fixed maturity investments | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Convertible fixed maturity investments | Dec. 31, 2013 Fair value measured on a recurring basis Fair value Other long-term investments | Dec. 31, 2012 Fair value measured on a recurring basis Fair value Other long-term investments | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 US Government and agency obligations | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 US Government and agency obligations | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations Financials | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations Financials | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations Consumer | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations Consumer | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations Industrial | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations Industrial | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations Communications | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations Communications | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations Utilities | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations Utilities | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations Energy | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations Energy | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations Basic Materials | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations Basic Materials | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations Technology | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations Technology | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations Other | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Debt securities issued by corporations Other | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Mortgage-backed and asset-backed securities | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Mortgage-backed and asset-backed securities | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Foreign government, agency and provincial obligations | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Foreign government, agency and provincial obligations | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Preferred stocks | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Preferred stocks | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Municipal obligations | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Municipal obligations | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Fixed maturity investments | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Fixed maturity investments | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Short-term investments | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Short-term investments | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Common equity securities Financials | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Common equity securities Financials | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Common equity securities Consumer | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Common equity securities Consumer | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Common equity securities Industrial | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Common equity securities Industrial | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Common equity securities Communications | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Common equity securities Communications | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Common equity securities Utilities | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Common equity securities Utilities | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Common equity securities Energy | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Common equity securities Energy | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Common equity securities Basic Materials | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Common equity securities Basic Materials | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Common equity securities Technology | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Common equity securities Technology | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Common equity securities Other | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Common equity securities Other | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Common equity securities | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Common equity securities | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Convertible fixed maturity investments | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Convertible fixed maturity investments | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Other long-term investments | Dec. 31, 2012 Fair value measured on a recurring basis Level 1 Other long-term investments | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 US Government and agency obligations | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 US Government and agency obligations | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations Financials | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations Financials | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations Consumer | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations Consumer | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations Industrial | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations Industrial | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations Communications | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations Communications | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations Utilities | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations Utilities | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations Energy | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations Energy | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations Basic Materials | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations Basic Materials | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations Technology | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations Technology | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations Other | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Debt securities issued by corporations Other | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Mortgage-backed and asset-backed securities | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Mortgage-backed and asset-backed securities | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Foreign government, agency and provincial obligations | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Foreign government, agency and provincial obligations | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Preferred stocks | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Preferred stocks | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Municipal obligations | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Municipal obligations | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Fixed maturity investments | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Fixed maturity investments | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Short-term investments | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Short-term investments | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Common equity securities Financials | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Common equity securities Financials | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Common equity securities Consumer | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Common equity securities Consumer | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Common equity securities Industrial | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Common equity securities Industrial | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Common equity securities Communications | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Common equity securities Communications | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Common equity securities Utilities | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Common equity securities Utilities | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Common equity securities Energy | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Common equity securities Energy | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Common equity securities Basic Materials | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Common equity securities Basic Materials | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Common equity securities Technology | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Common equity securities Technology | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Common equity securities Other | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Common equity securities Other | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Common equity securities | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Common equity securities | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Convertible fixed maturity investments | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Convertible fixed maturity investments | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Other long-term investments | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Other long-term investments | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Forward contracts | Dec. 31, 2012 Fair value measured on a recurring basis Level 2 Forward contracts | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 US Government and agency obligations | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 US Government and agency obligations | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations Financials | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations Financials | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations Consumer | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations Consumer | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations Industrial | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations Industrial | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations Communications | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations Communications | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations Utilities | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations Utilities | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations Energy | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations Energy | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations Basic Materials | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations Basic Materials | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations Technology | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations Technology | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations Other | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Debt securities issued by corporations Other | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Mortgage-backed and asset-backed securities | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Mortgage-backed and asset-backed securities | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Foreign government, agency and provincial obligations | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Foreign government, agency and provincial obligations | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Preferred stocks | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Preferred stocks | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Municipal obligations | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Municipal obligations | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Fixed maturity investments | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Fixed maturity investments | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Short-term investments | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Short-term investments | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Common equity securities Financials | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Common equity securities Financials | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Common equity securities Consumer | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Common equity securities Consumer | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Common equity securities Industrial | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Common equity securities Industrial | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Common equity securities Communications | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Common equity securities Communications | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Common equity securities Utilities | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Common equity securities Utilities | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Common equity securities Energy | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Common equity securities Energy | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Common equity securities Basic Materials | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Common equity securities Basic Materials | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Common equity securities Technology | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Common equity securities Technology | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Common equity securities Other | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Common equity securities Other | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Common equity securities | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Common equity securities | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Convertible fixed maturity investments | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Convertible fixed maturity investments | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Other long-term investments | Dec. 31, 2012 Fair value measured on a recurring basis Level 3 Other long-term investments | Dec. 31, 2011 Fair value measured on a recurring basis Level 3 Other long-term investments | Dec. 31, 2013 Banks, trust and insurance companies Fair value measured on a recurring basis Fair value Common equity securities Financials
Investment securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of investments recorded at fair value | 95.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of price difference provided by pricing services | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum price difference provided by pricing services | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value investments |  |  | 2,347,200,000 | [1] | 2,385,100,000 | [1] |  |  |  | 6,766,500,000 | [2],[3],[4] | 6,950,700,000 | [2],[3],[4],[5],[6],[7] | 7,500,800,000 | [5],[6],[7] | 2,014,500,000 | 2,095,600,000 | 1,376,700,000 | 1,355,100,000 | 1,033,100,000 | 4,982,200,000 | 5,206,100,000 | 6,088,200,000 | 1,992,500,000 | 2,073,500,000 | 22,000,000 | 22,100,000 | 93,000,000 | 92,900,000 | 78,900,000 | 46,100,000 | 37,300,000 | 32,300,000 | 6,100,000 | 0 | 0.0 | 262,400,000 | [2] | 259,300,000 | [2],[6] | 268,300,000 | [6] | 7,402,400,000 | 7,581,300,000 | 362,500,000 | 440,100,000 | 2,347,200,000 | 2,385,100,000 | 434,400,000 | 401,400,000 | 754,400,000 | 727,100,000 | 281,100,000 | 330,800,000 | 265,000,000 | 276,100,000 | 173,600,000 | 204,200,000 | 159,700,000 | 181,500,000 | 149,100,000 | 189,100,000 | 91,200,000 | 54,000,000 | 38,700,000 | 20,900,000 | 2,014,500,000 | 2,095,600,000 | 439,900,000 | 521,900,000 | 84,800,000 | 86,400,000 | 17,900,000 | 5,200,000 | 5,266,800,000 | [8] | 5,534,300,000 | [9] | 635,900,000 | 630,600,000 | 0 | 324,500,000 | 308,200,000 | 255,600,000 | 105,400,000 | 41,900,000 | 57,100,000 | 35,200,000 | 34,300,000 | 43,600,000 | 78,600,000 | 101,000,000 | 53,400,000 | 103,300,000 | 60,600,000 | 55,000,000 | 98,800,000 | 69,600,000 | 1,156,800,000 | 1,029,700,000 | 80,500,000 | 127,400,000 | 262,400,000 | [10] | 259,300,000 | [11] | 1,998,200,000 | 1,985,700,000 | 295,800,000 | 369,100,000 | 0 | 1,000,000 | 0 | 1,000,000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 44,500,000 | 52,100,000 | 0 | 0 | 0 | 0 | 340,300,000 | [8] | 422,200,000 | [9] | 621,500,000 | 630,600,000 | 314,300,000 | 286,300,000 | 308,200,000 | 255,600,000 | 105,400,000 | 41,900,000 | 57,100,000 | 35,200,000 | 34,300,000 | 43,400,000 | 78,600,000 | 101,000,000 | 53,400,000 | 103,300,000 | 60,600,000 | 55,000,000 | 24,500,000 | 11,200,000 | 1,036,400,000 | 932,900,000 | 0 | 0 | 0 | [10] | 0 | [11] | 4,996,600,000 | 5,206,100,000 | 66,700,000 | 71,000,000 | 2,347,200,000 | 2,384,100,000 | 434,400,000 | 400,400,000 | 754,400,000 | 727,100,000 | 281,100,000 | 330,800,000 | 265,000,000 | 276,100,000 | 173,600,000 | 204,200,000 | 159,700,000 | 181,500,000 | 149,100,000 | 189,100,000 | 91,200,000 | 54,000,000 | 38,700,000 | 20,900,000 | 1,992,500,000 | 2,073,500,000 | 395,400,000 | 469,800,000 | 13,800,000 | 15,600,000 | 17,900,000 | 5,200,000 | 4,833,500,000 | [8] | 5,019,200,000 | [9] | 14,400,000 | 0 | 0 | 900,000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 200,000 | 0 | 0 | 0 | 0 | 0 | 0 | 74,300,000 | 58,400,000 | 74,300,000 | 59,500,000 | 74,400,000 | 127,400,000 | 0 | [10] | 0 | [11] |  |  | 407,600,000 | 389,500,000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 22,000,000 | 22,100,000 | 0 | 0 | 71,000,000 | 70,800,000 | 0 | 0 | 93,000,000 | [8] | 92,900,000 | [9] | 0 | 0 | 46,100,000 | 37,300,000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 46,100,000 | 37,300,000 | 6,100,000 | 0 | 262,400,000 | [10] | 259,300,000 | [11] |  | 360,400,000
Investments reclassified to assets held for sale |  |  |  |  |  |  | 236,300,000 | 338,100,000 | 111,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of investment accounted for using the equity method |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,600,000 |  | 35,000,000 |  | 33,000,000 |
Change in fair value of derivatives, included in other revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (100,000) | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value, investment-related liabilities | $ 86,300,000 | $ 79,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Credit ratings are assigned based on the following hierarchy: 1) Standard & Poor’s and 2) Moody’s
[2] | Excludes carrying value of $26.6 and $35.0 at December 31, 2013 and January 1, 2013 associated with other long-term investments accounted for using the equity method and $(.1) at December 31, 2013 related to currency forward contracts.
[3] | Excludes carrying value of $635.9 and $630.6 at December 31, 2013 and January 1, 2013 classified as short-term investments.
[4] | Carrying value includes $236.3 and $338.1 at December 31, 2013 and January 1, 2013 that is classified as assets held for sale relating to discontinued operations.
[5] | Carrying value includes $338.1 and $111.8 at December 31, 2012 and January 1, 2012 that is classified as assets held for sale relating to AutoOne discontinued operations.
[6] | Excludes carrying value of $35.0 and $33.0 at December 31, 2012 and January 1, 2012 associated with other long-term investment limited partnerships accounted for using the equity method and $(.1) at December 31, 2012 related to currency forward contracts.
[7] | Excludes carrying value of $630.6 and $846.0 at December 31, 2012 and January 1, 2012 classified as short-term investments.
[8] | Carrying value includes $236.3 that is classified as assets held for sale relating to discontinued operations.
[9] | Carrying value includes $338.1 that is classified as assets held for sale relating to discontinued operations.
[10] | Excludes carrying value of $26.6 associated with other long-term investment limited partnerships accounted for using the equity method and $(.1) related to currency forward contracts.
[11] | Excludes carrying value of $35.0 associated with other long-term investment limited partnerships accounted for using the equity method and $(.1) related to currency forward contracts.

X
- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition Fair value portion of investments accounted under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6903542&loc=d3e32014-111567 + Details
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Balance Type: | debit
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- Definition Fair value of obligations incurred from short sales. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29643654&loc=d3e42429-110968 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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- Details
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- Definition Represents the maximum price difference provided by the pricing services between the market price and the actual sale price of securities, on the basis of which outliers are considered. + References No definition available. + Details
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- Definition Represents the maximum percentage of price difference provided by the pricing services between the market price and the actual sale price of securities, on the basis of which outliers are considered. + References No definition available. + Details
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Period Type: | duration

X
- Definition Represents the percentage of the total investment portfolio recorded at fair value based upon quoted market prices or other observable inputs. + References No definition available. + Details
Name: | wtm_PercentageOfInvestmentsRecordedAtFairValue
Namespace Prefix: | wtm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the fair value of trading debt securities re-classified to assets held for sale. + References No definition available. + Details
Name: | wtm_TradingSecuritiesDebtReclassifiedToAssetsHeldForSale
Namespace Prefix: | wtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant