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Reserves for Losses and Loss Adjustment Expenses (Tables) | 3 Months Ended
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Mar. 31, 2017
Insurance [Abstract] |
Reconciliation of Beginning and Ending Consolidated Loss and Loss Adjustment Expenses ("LAE") Reserves | The following table represents a reconciliation of beginning and ending consolidated loss and loss adjustment expenses (“LAE”) reserves for the three months ended March 31, 2017 and 2016 and the twelve months ended December 31, 2016:
| Three Months Ended March 31, 2017 |  | Three Months Ended March 31, 2016 |  | Twelve Months Ended December 31, 2016
| ($ in millions)
Provision for losses and LAE at the start of the year | $ | 5,319.9 |  |  | $ | 4,938.2 |  |  | $ | 4,938.2 |
Less reinsurance recoverable | (560.7 | ) |  | (354.8 | ) |  | (354.8 | )
Net loss and LAE at the start of the year | 4,759.2 |  |  | 4,583.4 |  |  | 4,583.4 |
Net loss and LAE expenses assumed | — |  |  | 5.7 |  |  | (80.1 | )
Provision for losses and LAE for claims incurred: |  |  |  |  |
Current year | 354.4 |  |  | 379.0 |  |  | 1,705.4 |
Prior years | (26.2 | ) |  | (21.6 | ) |  | (129.3 | )
Total incurred | 328.2 |  |  | 357.4 |  |  | 1,576.1 |
Losses and LAE payments for claims incurred: |  |  |  |  |
Current year | (14.8 | ) |  | (8.5 | ) |  | (241.0 | )
Prior years | (383.6 | ) |  | (286.1 | ) |  | (981.8 | )
Total paid | (398.4 | ) |  | (294.6 | ) |  | (1,222.8 | )
Foreign exchange losses/(gains) | 41.1 |  |  | (6.4 | ) |  | (97.4 | )
Net losses and LAE reserves at period end | 4,730.1 |  |  | 4,645.5 |  |  | 4,759.2 |
Plus reinsurance recoverable on unpaid losses at period end | 635.8 |  |  | 366.0 |  |  | 560.7 |
Provision for losses and LAE at the end of the relevant period | $ | 5,365.9 |  |  | $ | 5,011.5 |  |  | $ | 5,319.9 |
Short-duration Insurance Contracts, Claims Development | The following tables show an analysis of incurred claims and allocated loss adjustment expenses, net of reinsurance and cumulative paid claims and allocated claim adjustment expenses, net of reinsurance as at March 31, 2017, December 31, 2016, 2015, 2014, 2013 and 2012. The loss development triangles are derived from all business written by the Company as although a limited number of contracts are written which have durations of greater than one year the contracts do not meet the definition of a long duration contract.
|  | Insurance |  |  |  |
|  | Incurred Claims, IBNR and Loss Adjustment Expenses, Net of Reinsurance |  | As at March 31, 2017
|  |  |  |  |  |  |  |  |  |  |  |  |  | Total of IBNR Plus Expected Development on Reported Claims |  | Cumulative Number of Reported Claims
|  | For the Years Ended December 31, |  |  |  |
|  | Unaudited Prior Years |  |  |  |  |  |
Accident Year |  | 2012 |  | 2013 |  | 2014 |  | 2015 |  | 2016 |  | Q1 2017 |  |
|  | $ (in millions) |  |  |  |
2012 |  | 599.2 |  |  | 621.6 |  |  | 650.5 |  |  | 664.1 |  |  | 649.0 |  |  | 644.7 |  |  | 58.1 |  |  | 15,513 |
2013 |  |  |  | 683.5 |  |  | 662.2 |  |  | 673.4 |  |  | 654.6 |  |  | 659.7 |  |  | 98.5 |  |  | 14,415 |
2014 |  |  |  |  |  | 749.2 |  |  | 723.9 |  |  | 696.4 |  |  | 701.5 |  |  | 153.5 |  |  | 18,459 |
2015 |  |  |  |  |  |  |  | 906.1 |  |  | 895.3 |  |  | 879.5 |  |  | 261.7 |  |  | 20,271 |
2016 |  |  |  |  |  |  |  |  |  | 899.0 |  |  | 919.1 |  |  | 417.6 |  |  | 18,879 |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 193.7 |  |  | 165.0 |  |  | 2,561 |
|  |  |  |  |  |  |  |  |  |  | Total |  |  |  |  | $ | 3,998.2 |  |  |  |  |
|  | Insurance
|  | Cumulative Paid Claims and Allocated Loss Adjustment Expenses, Net of Reinsurance
|  | For the Years Ended December 31, |  |
Accident Year |  | 2012 |  | 2013 |  | 2014 |  | 2015 |  | 2016 |  | Q1 2017
|  | ($ in millions) |  |
2012 |  | 115.7 |  |  | 305.1 |  |  | 374.9 |  |  | 448.4 |  |  | 497.9 |  |  | 505.1 |
2013 |  |  |  | 89.5 |  |  | 252.0 |  |  | 361.7 |  |  | 451.0 |  |  | 459.6 |
2014 |  |  |  |  |  | 98.9 |  |  | 245.5 |  |  | 386.8 |  |  | 400.7 |
2015 |  |  |  |  |  |  |  | 118.0 |  |  | 322.9 |  |  | 386.9 |
2016 |  |  |  |  |  |  |  |  |  | 116.0 |  |  | 197.3 |
2017 |  |  |  |  |  |  |  |  |  |  |  | 3.2 |
|  |  |  |  |  |  |  |  |  |  |  |  | Total |  |  | $ | 1,952.8 |
|  | All outstanding liabilities for 2012 and subsequent years, net of reinsurance |  |  | $ | 2,045.4 |
|  |  |  | All outstanding liabilities before 2012, net of reinsurance |  |  | 211.2 |
|  |  |  | Liabilities for claims and claim adjustment expenses, net of reinsurance |  |  | $ | 2,256.6 |
|  | Reinsurance |  |  |  |
|  | Incurred Claims, IBNR and Loss Adjustment Expenses, Net of Reinsurance |  | As at March 31, 2017
|  |  |  |  |  |  |  |  |  |  |  |  |  | Total of IBNR Plus Expected Development on Reported Claims |  | Cumulative Number of Reported Claims
|  | For the Years Ended December 31, |  |  |  |
|  | Unaudited Prior Years |  |  |  |  |  |
Accident Year |  | 2012 |  | 2013 |  | 2014 |  | 2015 |  | 2016 |  | Q1 2017 |  |
|  | $ (in millions) |  |  |  |
2012 |  | 686.3 |  |  | 730.9 |  |  | 714.3 |  |  | 684.8 |  |  | 683.6 |  |  | 681.0 |  |  | 103.3 |  |  | 3,566 |
2013 |  |  |  | 569.6 |  |  | 561.8 |  |  | 540.7 |  |  | 515.2 |  |  | 510.9 |  |  | 108.2 |  |  | 3,356 |
2014 |  |  |  |  |  | 543.4 |  |  | 522.5 |  |  | 506.9 |  |  | 499.4 |  |  | 142.1 |  |  | 3,183 |
2015 |  |  |  |  |  |  |  | 573.5 |  |  | 556.2 |  |  | 539.9 |  |  | 197.0 |  |  | 3,088 |
2016 |  |  |  |  |  |  |  |  |  | 741.1 |  |  | 768.0 |  |  | 406.4 |  |  | 2,415 |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 176.4 |  |  | 141.6 |  |  | 849 |
|  |  |  |  |  |  |  |  |  |  | Total |  |  |  |  | $ | 3,175.6 |  |  |  |  |
|  | Reinsurance
|  | Cumulative Paid Claims and Allocated Loss Adjustment Expenses, Net of Reinsurance
|  | For the Years Ended December 31, |  |
Accident Year |  | 2012 |  | 2013 |  | 2014 |  | 2015 |  | 2016 |  | Q1 2017
|  | ($ in millions) |  |
2012 |  | 62.7 |  |  | 245.3 |  |  | 357.4 |  |  | 410.9 |  |  | 454.6 |  |  | 471.2 |
2013 |  |  |  | 62.1 |  |  | 181.9 |  |  | 272.3 |  |  | 313.5 |  |  | 321.6 |
2014 |  |  |  |  |  | 56.3 |  |  | 169.8 |  |  | 244.9 |  |  | 255.7 |
2015 |  |  |  |  |  |  |  | 56.7 |  |  | 168.8 |  |  | 210.6 |
2016 |  |  |  |  |  |  |  |  |  | 124.9 |  |  | 177.1 |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.6 |
|  |  |  |  |  |  |  |  |  |  |  |  | Total |  |  | $ | 1,447.8 |
|  | All outstanding liabilities for 2012 and subsequent years, net of reinsurance |  |  | 1,727.8 |
|  |  |  | All outstanding liabilities before 2012, net of reinsurance |  |  | 710.2 |
|  |  |  | Liabilities for claims and claim adjustment expenses, net of reinsurance |  |  | $ | 2,438.0 |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability |
| Three Months Ended March 31, 2017
| ($ in millions)
Net outstanding liabilities: |
Insurance lines | $ | 2,256.6 |
Reinsurance lines | 2,438.0 |
Net loss and LAE | 4,694.6 |
Reinsurance recoverable on unpaid losses: |
Insurance lines | 548.4 |
Reinsurance lines | 87.4 |
Total reinsurance recoverable on unpaid losses | 635.8 |
Insurance lines other than short-duration | — |
Unallocated claims incurred | 40.0 |
Other | (4.5 | )
| $ | 35.5 |
Provision for losses and LAE at the end of the period | $ | 5,365.9 |
Short-duration Insurance Contracts, Schedule of Historical Claims Duration | Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Years |  | 1 |  | 2 |  | 3 |  | 4 |  | 5
Insurance |  | 14.4 | % |  | 24.5 | % |  | 15.9 | % |  | 12.5 | % |  | 7.6 | %
Reinsurance |  | 11.9 | % |  | 23.1 | % |  | 16.3 | % |  | 7.9 | % |  | 6.4 | %

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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 -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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- Definition Tabular disclosure of undiscounted information about claims development by accident year for short-duration insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671311-158438 + Details
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- Definition Tabular disclosure for the reconciliation of claims development to the liability for unpaid claims and claim adjustment expense for short-duration insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671315-158438 + Details
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- Definition Tabular disclosure of average annual percentage payout of incurred claims by age, after reinsurance, for short-duration insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4G -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671329-158438 + Details
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