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Investment Securities (Fair Value Measurement by Level) (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended | 9 Months Ended |  |  |  |
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Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Fair Value | Dec. 31, 2013 Fair Value | Sep. 30, 2013 Fair Value | Dec. 31, 2012 Fair Value | Sep. 30, 2014 Level 1 Inputs | Dec. 31, 2013 Level 1 Inputs | Sep. 30, 2013 Level 1 Inputs | Dec. 31, 2012 Level 1 Inputs | Sep. 30, 2014 Level 2 Inputs | Dec. 31, 2013 Level 2 Inputs | Sep. 30, 2013 Level 2 Inputs | Dec. 31, 2012 Level 2 Inputs | Sep. 30, 2014 Debt securities issued by corporations | Dec. 31, 2013 Debt securities issued by corporations | Sep. 30, 2014 Mortgage-backed and asset-backed securities Fair Value | Dec. 31, 2013 Mortgage-backed and asset-backed securities Fair Value | Sep. 30, 2014 Mortgage-backed and asset-backed securities Level 2 Inputs | Dec. 31, 2013 Mortgage-backed and asset-backed securities Level 2 Inputs | Sep. 30, 2014 Mortgage-backed and asset-backed securities Level 3 Inputs | Dec. 31, 2013 Mortgage-backed and asset-backed securities Level 3 Inputs | Sep. 30, 2014 Fixed maturity investments. Level 3 Inputs | Dec. 31, 2013 Fixed maturity investments. Level 3 Inputs | Sep. 30, 2013 Fixed maturity investments. Level 3 Inputs | Dec. 31, 2012 Fixed maturity investments. Level 3 Inputs | Sep. 30, 2014 Common equity securities Level 3 Inputs | Dec. 31, 2013 Common equity securities Level 3 Inputs | Sep. 30, 2013 Common equity securities Level 3 Inputs | Dec. 31, 2012 Common equity securities Level 3 Inputs | Sep. 30, 2014 Convertible fixed maturity investments Level 3 Inputs | Dec. 31, 2013 Convertible fixed maturity investments Level 3 Inputs | Sep. 30, 2013 Convertible fixed maturity investments Level 3 Inputs | Dec. 31, 2012 Convertible fixed maturity investments Level 3 Inputs | Sep. 30, 2014 Other long-term investments Level 3 Inputs | Dec. 31, 2013 Other long-term investments Level 3 Inputs | Sep. 30, 2013 Other long-term investments Level 3 Inputs | Dec. 31, 2012 Other long-term investments Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis U.S. Government and agency obligations Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis U.S. Government and agency obligations Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis U.S. Government and agency obligations Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis U.S. Government and agency obligations Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis U.S. Government and agency obligations Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis U.S. Government and agency obligations Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis U.S. Government and agency obligations Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis U.S. Government and agency obligations Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Consumer Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Consumer Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Consumer Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Consumer Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Consumer Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Consumer Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Consumer Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Consumer Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Industrial Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Industrial Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Industrial Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Industrial Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Industrial Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Industrial Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Industrial Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Industrial Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Financials Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Financials Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Financials Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Financials Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Financials Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Financials Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Financials Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Financials Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Communications [Member] Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Communications [Member] Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Communications [Member] Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Communications [Member] Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Communications [Member] Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Communications [Member] Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Communications [Member] Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Communications [Member] Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Energy Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Energy Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Energy Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Energy Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Energy Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Energy Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Energy Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Technology Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Technology Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Technology Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Technology Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Technology Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Technology Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Technology Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Technology Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Utilities Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Utilities Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Utilities Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Utilities Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Utilities Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Utilities Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Utilities Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Utilities Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Basic Materials [Member] Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Basic Materials [Member] Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Basic Materials [Member] Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Basic Materials [Member] Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Basic Materials [Member] Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Basic Materials [Member] Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Basic Materials [Member] Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Basic Materials [Member] Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Other: Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Other: Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Other: Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Other: Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Other: Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Other: Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Debt securities issued by corporations Other: Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Debt securities issued by corporations Other: Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Municipal obligations Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Municipal obligations Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Municipal obligations Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Municipal obligations Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Municipal obligations Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Municipal obligations Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Municipal obligations Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Municipal obligations Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Mortgage-backed and asset-backed securities Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Mortgage-backed and asset-backed securities Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Mortgage-backed and asset-backed securities Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Mortgage-backed and asset-backed securities Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Mortgage-backed and asset-backed securities Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Mortgage-backed and asset-backed securities Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Mortgage-backed and asset-backed securities Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Mortgage-backed and asset-backed securities Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Foreign government, agency and provincial obligations Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Foreign government, agency and provincial obligations Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Foreign government, agency and provincial obligations Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Foreign government, agency and provincial obligations Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Foreign government, agency and provincial obligations Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Foreign government, agency and provincial obligations Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Foreign government, agency and provincial obligations Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Foreign government, agency and provincial obligations Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Preferred Stock Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Preferred Stock Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Preferred Stock Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Preferred Stock Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Preferred Stock Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Preferred Stock Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Preferred Stock Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Preferred Stock Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Fixed maturity investments. Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Fixed maturity investments. Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Fixed maturity investments. Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Fixed maturity investments. Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Fixed maturity investments. Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Fixed maturity investments. Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Fixed maturity investments. Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Fixed maturity investments. Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Short-term investments Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Short-term investments Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Short-term investments Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Short-term investments Level 1 Inputs | Sep. 30, 2013 Fair value measured on a recurring basis Short-term investments Level 1 Inputs | Dec. 31, 2012 Fair value measured on a recurring basis Short-term investments Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Short-term investments Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Short-term investments Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Short-term investments Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Short-term investments Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Consumer Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Consumer Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Consumer Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Consumer Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Consumer Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Consumer Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Consumer Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Consumer Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Industrial Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Industrial Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Industrial Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Industrial Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Industrial Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Industrial Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Industrial Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Industrial Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Financials Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Financials Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Financials Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Financials Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Financials Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Financials Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Financials Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Financials Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Communications [Member] Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Communications [Member] Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Communications [Member] Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Communications [Member] Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Communications [Member] Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Communications [Member] Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Communications [Member] Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Communications [Member] Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Energy Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Energy Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Energy Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Energy Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Energy Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Energy Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Energy Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Energy Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Technology Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Technology Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Technology Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Technology Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Technology Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Technology Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Technology Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Technology Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Utilities Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Utilities Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Utilities Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Utilities Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Utilities Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Utilities Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Utilities Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Utilities Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Basic Materials [Member] Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Basic Materials [Member] Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Basic Materials [Member] Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Basic Materials [Member] Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Basic Materials [Member] Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Basic Materials [Member] Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Basic Materials [Member] Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Basic Materials [Member] Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Other: Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Other: Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Other: Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Other: Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Other: Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Other: Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Other: Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Other: Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Common equity securities Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Common equity securities Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Convertible fixed maturity investments Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Convertible fixed maturity investments Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Convertible fixed maturity investments Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Convertible fixed maturity investments Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Convertible fixed maturity investments Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Convertible fixed maturity investments Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Convertible fixed maturity investments Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Convertible fixed maturity investments Level 3 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Other long-term investments Fair Value | Dec. 31, 2013 Fair value measured on a recurring basis Other long-term investments Fair Value | Sep. 30, 2014 Fair value measured on a recurring basis Other long-term investments Level 1 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Other long-term investments Level 1 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Other long-term investments Level 2 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Other long-term investments Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Other long-term investments Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Other long-term investments Level 3 Inputs | Sep. 30, 2013 Fair value measured on a recurring basis Other long-term investments Level 3 Inputs | Dec. 31, 2012 Fair value measured on a recurring basis Other long-term investments Level 3 Inputs | Dec. 31, 2013 Fair value measured on a recurring basis Forward Contracts Level 2 Inputs | Sep. 30, 2014 Fair value measured on a recurring basis Forward Contracts Level 3 Inputs | Sep. 30, 2013 Fair value measured on a recurring basis Forward Contracts Level 3 Inputs | Sep. 30, 2014 Segment, Discontinued Operations | Dec. 31, 2013 Segment, Discontinued Operations | Sep. 30, 2013 Segment, Discontinued Operations | Dec. 31, 2012 Segment, Discontinued Operations
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value investments |  |  | $ 6,321.6 | $ 6,766.5 | $ 6,622.4 | $ 6,950.7 | $ 1,089.9 | $ 1,376.7 | $ 1,370.5 | $ 1,355.1 | $ 4,785.2 | $ 4,982.2 | $ 4,761.9 | $ 5,206.1 | $ 2,387.3 | $ 2,347.2 | $ 1,864.9 | $ 2,014.5 | $ 1,842.9 | $ 1,992.5 | $ 22.0 | $ 22.0 | $ 99.5 | $ 93.0 | $ 180.0 | $ 92.9 | $ 38.9 | $ 46.1 | $ 36.8 | $ 37.3 | $ 10.9 | $ 6.1 | $ 0 | $ 0 | $ 297.2 | $ 262.4 | $ 273.2 | $ 259.3 | $ 7,156.5 | $ 7,402.4 | $ 1,923.8 | $ 1,998.2 | $ 4,786.2 | $ 4,996.6 | $ 446.5 | $ 407.6 | $ 259.7 | $ 362.5 | $ 197.1 | $ 295.8 | $ 62.6 | $ 66.7 | $ 0 | $ 0 | $ 2,387.3 | $ 2,347.2 | $ 0 | $ 0 | $ 2,381.3 | $ 2,347.2 | $ 6.0 | $ 0 | $ 680.5 | $ 754.4 | $ 0 | $ 0 | $ 680.5 | $ 754.4 | $ 0 | $ 0 | $ 407.8 | $ 281.1 | $ 0 | $ 0 | $ 407.8 | $ 281.1 | $ 0 | $ 0 | $ 476.4 | $ 434.4 | $ 0 | $ 0 | $ 476.4 | $ 434.4 | $ 0 | $ 0 | $ 260.3 | $ 265.0 | $ 0 | $ 0 | $ 260.3 | $ 265.0 | $ 0 | $ 0 | $ 179.8 | $ 159.7 | $ 0 | $ 0 | $ 179.8 | $ 159.7 | $ 0 | $ 56.8 | $ 91.2 | $ 0 | $ 0 | $ 56.8 | $ 91.2 | $ 0 | $ 0 | $ 161.1 | $ 173.6 | $ 0 | $ 0 | $ 161.1 | $ 173.6 | $ 0 | $ 0 | $ 140.7 | $ 149.1 | $ 0 | $ 0 | $ 134.7 | $ 149.1 | $ 6.0 | $ 0 | $ 23.9 | $ 38.7 | $ 0 | $ 0 | $ 23.9 | $ 38.7 | $ 0 | $ 0 | $ 79.9 | $ 17.9 | $ 0 | $ 0 | $ 79.9 | $ 17.9 | $ 0 | $ 0 | $ 1,864.9 | $ 2,014.5 | $ 0 | $ 0 | $ 1,842.9 | $ 1,992.5 | $ 22.0 | $ 22.0 | $ 311.2 | $ 439.9 | $ 22.1 | $ 44.5 | $ 289.1 | $ 395.4 | $ 0 | $ 0 | $ 86.4 | $ 84.8 | $ 0 | $ 0 | $ 14.9 | $ 13.8 | $ 71.5 | $ 71.0 | $ 4,989.4 | $ 5,266.8 | $ 219.2 | $ 340.3 | $ 4,670.7 | $ 4,833.5 | $ 99.5 | $ 93.0 | $ 834.9 | $ 635.9 | $ 833.9 | $ 621.5 |  |  | $ 1.0 | $ 14.4 | $ 0 | $ 0 | $ 277.5 | $ 308.2 | $ 277.2 | $ 308.2 | $ 0.3 | $ 0 | $ 0 | $ 0 | $ 97.1 | $ 105.4 | $ 97.1 | $ 105.4 | $ 0 | $ 0 | $ 0 | $ 0 | $ 296.4 | $ 360.4 | $ 257.5 | $ 314.3 | $ 0 | $ 0 | $ 38.9 | $ 46.1 | $ 54.6 | $ 57.1 | $ 54.6 | $ 57.1 | $ 0 | $ 0 | $ 0 | $ 0 | $ 58.8 | $ 78.6 | $ 58.8 | $ 78.6 | $ 0 | $ 0 | $ 0 | $ 0 | $ 36.8 | $ 60.6 | $ 36.8 | $ 60.6 | $ 0 | $ 0 | $ 0 | $ 0 | $ 22.3 | $ 34.3 | $ 22.3 | $ 34.3 | $ 0 | $ 0 | $ 0 | $ 0 | $ 38.9 | $ 53.4 | $ 38.9 | $ 53.4 | $ 0 | $ 0 | $ 0 | $ 0 | $ 103.7 | $ 98.8 | $ 27.5 | $ 24.5 | $ 76.2 | $ 74.3 | $ 0 | $ 0 | $ 986.1 | $ 1,156.8 | $ 870.7 | $ 1,036.4 | $ 76.5 | $ 74.3 | $ 38.9 | $ 46.1 | $ 48.9 | $ 80.5 | $ 0 | $ 0 | $ 38.0 | $ 74.4 | $ 10.9 | $ 6.1 | $ 297.2 | $ 262.4 | $ 0 | $ 0 | $ 0 | $ 0 | $ 297.2 | $ 262.4 |  |  |  |  |  |  |  |  |
Carrying value of investment accounted for using the equity method |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23.5 | 26.6 | 26.9 | 35.0 |  |  |  |  |  |  |
Realized and unrealized gains (losses) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.1) | 0.2 | (0.1) |  |  |  |
Fixed maturity investments reclassified to assets held for sale |  | 236.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 203.9 | 236.3 | 239.7 | 338.1
Short-term investments, at amortized cost (which approximates fair value) | $ 834.9 | $ 635.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 834.9 | $ 635.9 | $ 648.0 | $ 630.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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- 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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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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- Definition Represents the fair value of trading debt securities re-classified to assets held for sale. + References No definition available. + Details
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