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Derivatives (Pre-Tax Operating Results of WM Life Re) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Pre-tax operating results of WM Life Re |  |  |  |  |  |  |  |  |  |  |
Total revenues |  | $ 87.5 | $ 83.5 | $ 88.8 | $ (5.5) | $ 56.8 | $ 48.4 | $ 58.0 | $ 373.8 | $ 157.7 | $ 440.0
General and administrative expenses |  |  |  |  |  |  |  |  | (218.7) | (186.0) | (200.7)
Pre-tax (loss) income from continuing operations | $ 5.2 | $ 8.4 | $ (2.2) | $ (3.6) | $ (74.5) | $ (13.8) | $ (25.7) | $ (33.3) | $ 7.8 | (147.3) | 129.2
White Mountains Life Re |  |  |  |  |  |  |  |  |  |  |
Pre-tax operating results of WM Life Re |  |  |  |  |  |  |  |  |  |  |
Fees, included in other revenue |  |  |  |  |  |  |  |  |  | 1.2 | 9.3
Change in fair value of variable annuity liability, included in other revenue |  |  |  |  |  |  |  |  |  | (0.3) | (0.4)
Change in fair value of derivatives, included in other revenue |  |  |  |  |  |  |  |  |  | (2.0) | (8.8)
Foreign exchange, included in other revenue |  |  |  |  |  |  |  |  |  | 1.3 | (1.3)
Other investment loss |  |  |  |  |  |  |  |  |  | 0.0 | (0.4)
Total revenues |  |  |  |  |  |  |  |  |  | 0.2 | (1.6)
Death benefit claims paid, included in general and administrative expenses |  |  |  |  |  |  |  |  |  | (0.3) | (0.1)
General and administrative expenses |  |  |  |  |  |  |  |  |  | (2.6) | (4.0)
Pre-tax (loss) income from continuing operations |  |  |  |  |  |  |  |  |  | $ (2.7) | $ (5.7)

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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + 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 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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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 + 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=63488584&loc=d3e20235-122688 + Details
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