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Reserves for Unpaid Losses and Loss Adjustment Expenses (Reserve Summary) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 AutoOne | Dec. 31, 2012 AutoOne | Dec. 31, 2011 AutoOne | Dec. 31, 2010 AutoOne | Dec. 31, 2013 WM Solutions | Dec. 31, 2012 WM Solutions | Dec. 31, 2011 WM Solutions
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross beginning balance | $ 3,168.9 | $ 5,702.3 | $ 5,736.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less beginning reinsurance recoverable on unpaid losses | (429.1) | (2,507.3) | (2,344.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss and LAE reserves | 2,739.8 | 3,195.0 | 3,392.8 | 0 | [1] | 0 | [1] | (383.3) | [1] | (619.6) | [1] |  |  |  |  |  |
Loss and LAE reserves acquired |  |  |  |  |  |  |  |  |  |  |  | 37.7 | [2] | 17.0 | [2] | 21.0 | [2]
Loss and LAE incurred relating to current year losses | 1,088.9 | 1,235.8 | 1,251.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss and LAE incurred relating prior year losses | (48.4) | (41.9) | (76.7) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total incurred losses and LAE | 1,040.5 | 1,193.9 | 1,174.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion of fair value adjustment to net loss and LAE reserves | 1.7 | 10.6 | 8.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment to net loss and LAE reserves | 0.3 | 12.9 | 0.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss and LAE paid relating to current year losses | (336.2) | (404.7) | (387.9) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss and LAE paid relating to prior year losses | (832.6) | (901.6) | (777.3) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total loss and LAE payments | (1,168.8) | (1,306.3) | (1,165.2) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss and LAE reserves | 2,651.2 | 2,739.8 | 3,195.0 | 0 | [1] | 0 | [1] | (383.3) | [1] | (619.6) | [1] |  |  |  |  |  |
Plus ending reinsurance recoverable on unpaid losses | 428.1 | 429.1 | 2,507.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross ending balance | $ 3,079.3 | $ 3,168.9 | $ 5,702.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Loss and LAE reserve balances from OneBeacon’s Runoff Business prior to December 31, 2012 and AutoOne prior to December 31, 2011 were not classified as held for sale. Adjustment is to present loss and LAE reserve activities for continuing operations.
[2] | Loss and LAE reserves acquired relate to WM Solutions purchases of Empire and Ashmere in 2013, PICO, Citation, Woodridge and Oakwood in 2012 and Old Lyme in 2011.

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a),(b),(c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Total amount of payments made during the reporting period to settle insured claims and pay costs incurred in the claims settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of payments made in the reporting period to settle claims incurred in the current period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of payments made in the reporting period to settle claims incurred in prior periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of provision in the period for claims incurred in the reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of provision in the period for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph a -Article 7 + Details
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- Definition The amount of the other adjustment made to the claims reserves during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Estimated amount after valuation allowance of reinsurance recoverables, due from reinsurers for incurred claims not yet reported, and claims settlement expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21409-158489 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 7 + Details
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- Definition Represents the amount of accreted fair value adjustment to loss and LAE reserves related to purchase accounting. + References No definition available. + Details
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