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Derivatives (Pre-Tax Operating Results of WM Life Re) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Pre-tax operating results of WM Life Re |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 626.6 | $ 574.1 | $ 489.3 | $ 627.4 | $ 566.4 | $ 697.4 | $ 542.3 | $ 629.7 | $ 2,317.4 |  | $ 2,435.7 |  | $ 2,173.1 |
General and administrative expenses |  |  |  |  |  |  |  |  | (181.3) |  | (182.2) |  | (175.3) |
Pre-tax income | 134.2 | 55.3 | 3.6 | 151.8 | (50.8) | 135.1 | 37.6 | 140.9 | 344.9 |  | 262.8 |  | 98.0 |
White Mountains Life Re |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax operating results of WM Life Re |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees, included in other revenue |  |  |  |  |  |  |  |  | 25.0 |  | 31.8 |  | 32.5 |
Change in Fair Value of Variable Annuity Liability, included in other revenues |  |  |  |  |  |  |  |  | 378.5 |  | 312.8 |  | (156.5) |
Change in fair value of derivatives, included in other revenue |  |  |  |  |  |  |  |  | (402.0) |  | (339.0) |  | 92.9 |
Foreign exchange, included in other revenue |  |  |  |  |  |  |  |  | (14.5) |  | (30.3) |  | 15.1 |
Other investment income and (losses) gains |  |  |  |  |  |  |  |  | (7.1) |  | 2.5 |  | (0.9) |
Total revenues |  |  |  |  |  |  |  |  | (20.1) |  | (22.2) |  | (16.9) |
Change in fair value of variable annuity death benefit liabilities, included in general and administrative expenses |  |  |  |  |  |  |  |  | 10.2 |  | 14.2 |  | (1.8) |
Death benefit claims paid, included in general and administrative expenses |  |  |  |  |  |  |  |  | (1.9) |  | (5.7) |  | (3.8) |
General and administrative expenses |  |  |  |  |  |  |  |  | (4.9) |  | (5.2) |  | (4.7) |
Pre-tax income |  |  |  |  |  |  |  |  | (16.7) |  | (18.9) |  | (27.2) |
Level 3 | White Mountains Life Re |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax operating results of WM Life Re |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of derivatives, included in other revenue |  |  |  |  |  |  |  |  | 136.5 | [1] | 84.0 | [1] | (14.5) | [1]
Level 3 | Projected Surrender Assumption [Member] | White Mountains Life Re |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax operating results of WM Life Re |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of derivatives, included in other revenue |  |  |  |  |  |  |  |  | $ 6.5 |  |  |  | $ 7.2 |
[1] | Consists of over-the-counter instruments.

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- Definition Income from agency and brokerage operations (includes sales of annuities and supplemental contracts); service charges, commissions, and fees from the sale of insurance and related services; and management fees from separate accounts, deferred annuities, and universal life products. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(c),(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Subparagraph c, d -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 4 -Article 7 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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