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Reserve for Losses and Loss Expenses (Tables) | 12 Months Ended
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Dec. 31, 2015
Insurance Loss Reserves [Abstract] |
Schedule of Roll Forward of Reserves for Losses and Loss Expenses |
($ in thousands) |  | 2015 |  | 2014 |  | 2013
Gross reserves for losses and loss expenses, at beginning of year |  | $ | 3,477,870 |  |  | 3,349,770 |  |  | 4,068,941 |
Less: reinsurance recoverable on unpaid losses and loss expenses, at beginning of year |  | 571,978 |  |  | 540,839 |  |  | 1,409,755 |
Net reserves for losses and loss expenses, at beginning of year |  | 2,905,892 |  |  | 2,808,931 |  |  | 2,659,186 |
Incurred losses and loss expenses for claims occurring in the: |  |  |  |  |  |  |  |  |
Current year |  | 1,217,550 |  |  | 1,216,770 |  |  | 1,147,263 |
Prior years |  | (69,009 | ) |  | (59,269 | ) |  | (25,525 | )
Total incurred losses and loss expenses |  | 1,148,541 |  |  | 1,157,501 |  |  | 1,121,738 |
Paid losses and loss expenses for claims occurring in the: |  |  |  |  |  |  |  |  |
Current year |  | 446,550 |  |  | 468,478 |  |  | 399,559 |
Prior years |  | 641,174 |  |  | 592,062 |  |  | 572,434 |
Total paid losses and loss expenses |  | 1,087,724 |  |  | 1,060,540 |  |  | 971,993 |
Net reserves for losses and loss expenses, at end of year |  | 2,966,709 |  |  | 2,905,892 |  |  | 2,808,931 |
Add: Reinsurance recoverable on unpaid losses and loss expenses, at end of year |  | 551,019 |  |  | 571,978 |  |  | 540,839 |
Gross reserves for losses and loss expenses at end of year |  | $ | 3,517,728 |  |  | 3,477,870 |  |  | 3,349,770 |
Schedule of(Favorable)/ Unfavorable Prior Year Development |
(Favorable)/Unfavorable Prior Year Development |  |  |  |  |  |
($ in millions) |  | 2015 |  | 2014 |  | 2013
General Liability |  | $ | (51.0 | ) |  | (43.9 | ) |  | (20.0 | )
Commercial Automobile |  | 2.4 |  |  | (4.1 | ) |  | (4.5 | )
Workers Compensation |  | (37.0 | ) |  | — |  |  | 23.5 |
Businessowners' Policies |  | 2.2 |  |  | 1.9 |  |  | (9.5 | )
Commercial Property |  | (3.0 | ) |  | (2.1 | ) |  | (7.5 | )
Homeowners |  | 1.5 |  |  | (4.0 | ) |  | (2.5 | )
Personal Automobile |  | 0.4 |  |  | (10.8 | ) |  | (3.0 | )
E&S |  | 15.5 |  |  | 3.7 |  |  | (2.0 | )
Total |  | $ | (69.0 | ) |  | (59.3 | ) |  | (25.5 | )
Schedule of Exposure to Various Asbestos and Environmental Claims |
|  | 2015
($ in millions) |  | Gross |  | Net
Asbestos |  | $ | 8.0 |  |  | 6.8 |
Landfill sites |  | 13.1 |  |  | 8.3 |
Leaking underground storage tanks |  | 9.3 |  |  | 8.1 |
Total |  | $ | 30.4 |  |  | 23.2 |
Schedule of Roll Forward of Gross and Net Asbestos and Environmental Incurred Losses and Loss Expenses and Related Reserves |
|  | 2015 |  | 2014 |  | 2013
($ in thousands) |  | Gross |  | Net |  | Gross |  | Net |  | Gross |  | Net
Asbestos |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves for losses and loss expenses at beginning of year |  | $ | 8,751 |  |  | 7,314 |  |  | 8,897 |  |  | 7,518 |  |  | 9,170 |  |  | 7,791 |
Incurred losses and loss expenses |  | (428 | ) |  | (77 | ) |  | 60 |  |  | — |  |  | — |  |  | — |
Less: losses and loss expenses paid |  | (299 | ) |  | (444 | ) |  | (206 | ) |  | (204 | ) |  | (273 | ) |  | (273 | )
Reserves for losses and loss expenses at the end of year |  | $ | 8,024 |  |  | 6,793 |  |  | 8,751 |  |  | 7,314 |  |  | 8,897 |  |  | 7,518 |
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves for losses and loss expenses at beginning of year |  | $ | 21,902 |  |  | 15,680 |  |  | 23,867 |  |  | 17,649 |  |  | 26,405 |  |  | 19,978 |
Incurred losses and loss expenses |  | 3,396 |  |  | 3,397 |  |  | 107 |  |  | — |  |  | 347 |  |  | 68 |
Less: losses and loss expenses paid |  | (2,911 | ) |  | (2,709 | ) |  | (2,072 | ) |  | (1,969 | ) |  | (2,885 | ) |  | (2,397 | )
Reserves for losses and loss expenses at the end of year |  | $ | 22,387 |  |  | 16,368 |  |  | 21,902 |  |  | 15,680 |  |  | 23,867 |  |  | 17,649 |
Total Asbestos and Environmental Claims |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves for losses and loss expenses at beginning of year |  | $ | 30,653 |  |  | 22,994 |  |  | 32,764 |  |  | 25,167 |  |  | 35,575 |  |  | 27,769 |
Incurred losses and loss expenses |  | 2,968 |  |  | 3,320 |  |  | 167 |  |  | — |  |  | 347 |  |  | 68 |
Less: losses and loss expenses paid |  | (3,210 | ) |  | (3,153 | ) |  | (2,278 | ) |  | (2,173 | ) |  | (3,158 | ) |  | (2,670 | )
Reserves for losses and loss expenses at the end of year |  | $ | 30,411 |  |  | 23,161 |  |  | 30,653 |  |  | 22,994 |  |  | 32,764 |  |  | 25,167 |

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- Definition Tabular disclosure of the reasons for the change in incurred claims and claim adjustment expenses recognized in the income statement attributable to insured events of prior fiscal years. Also includes disclosures of additional premiums or return premiums accrued as a result of changes in incurred claims and claim adjustment expenses. + 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 (d) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section W + Details
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- Definition Tabular disclosure of the activity in the reserve for settling insured claims and expenses incurred in the claims settlement process for the period. The estimated liability includes the amount of money that will be required for future payments of (a) claims that have been reported to the insurer, (b) claims related to insured events that have occurred but that have not been reported to the insurer as of the date the liability is estimated, and (c) claim adjustment expenses. Claim adjustment expenses include costs incurred in the claim settlement process such as legal fees; outside adjuster fees; and costs to record, process, and adjust 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 (b) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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