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Derivatives Derivatives (Gross Asset (Gross liability) Amounts Offset Under Master Netting Agreements) (Details) (White Mountains Life Re, USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Derivative [Line Items] |  |  |  |
Derivative Asset | $ 106.0 | [1] | $ 206.5 | [1],[2]
Derivative Liability | (36.8) | [1] | (108.2) | [1]
Net amounts recognized in Other Assets | 69.2 | [1] | 98.3 | [1]
Interest Rate Contract | Over the Counter [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Asset | 2.4 |  | 52.6 | [2]
Derivative Liability | (11.7) |  | (26.9) |
Net amounts recognized in Other Assets | (9.3) |  | 25.7 |
Interest Rate Contract | Exchange Traded [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Asset | 1.0 |  | 1.6 | [2]
Derivative Liability | (1.6) |  | (0.2) |
Net amounts recognized in Other Assets | (0.6) |  | 1.4 |
Foreign Exchange Contract | Over the Counter [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Asset | 67.8 |  | 87.8 | [2]
Derivative Liability | (12.0) |  | (34.4) |
Net amounts recognized in Other Assets | 55.8 |  | 53.4 |
Foreign Exchange Contract | Exchange Traded [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Asset | 2.3 |  | 0.8 | [2]
Derivative Liability | 0 |  | (1.4) |
Net amounts recognized in Other Assets | 2.3 |  | (0.6) |
Equity Contract | Over the Counter [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Asset | 30.7 |  | 63.6 | [2]
Derivative Liability | (9.2) |  | (22.9) |
Net amounts recognized in Other Assets | 21.5 |  | 40.7 |
Equity Contract | Exchange Traded [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Asset | 1.8 |  | 0.1 | [2]
Derivative Liability | (2.3) |  | (22.4) |
Net amounts recognized in Other Assets | $ (0.5) |  | $ (22.3) |
[1] | All derivative instruments held by WM Life Re are subject to master netting arrangements.
[2] | Amount equal to fair value of instrument as recognized in other assets.

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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