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Reserves for Losses and Loss Adjustment Expenses | 3 Months Ended
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Mar. 31, 2018
Insurance [Abstract] |
Reserves For Loss And Adjustment Expenses [Text Block] | Reserves for Losses and Loss Adjustment Expenses 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, 2018 and 2017 and the twelve months ended December 31, 2017:
| Three Months Ended March 31, 2018 |  | Three Months Ended March 31, 2017 |  | Twelve Months Ended December 31, 2017
| ($ in millions)
Provision for losses and LAE at the start of the year | $ | 6,749.5 |  |  | $ | 5,319.9 |  |  | $ | 5,319.9 |
Less reinsurance recoverable | (1,515.2 | ) |  | (560.7 | ) |  | (560.7 | )
Net loss and LAE at the start of the year | 5,234.3 |  |  | 4,759.2 |  |  | 4,759.2 |
Net loss and LAE expenses (disposed) | — |  |  | — |  |  | (125.5 | )
Provision for losses and LAE for claims incurred: |  |  |  |  |
Current year | 347.9 |  |  | 354.4 |  |  | 2,100.1 |
Prior years | (37.7 | ) |  | (26.2 | ) |  | (105.4 | )
Total incurred | 310.2 |  |  | 328.2 |  |  | 1,994.7 |
Losses and LAE payments for claims incurred: |  |  |  |  |
Current year | (7.4 | ) |  | (14.8 | ) |  | (397.5 | )
Prior years | (483.7 | ) |  | (383.6 | ) |  | (1,157.6 | )
Total paid | (491.1 | ) |  | (398.4 | ) |  | (1,555.1 | )
Foreign exchange losses/(gains) | 14.7 |  |  | 41.1 |  |  | 161.0 |
Net losses and LAE reserves at period end | 5,068.1 |  |  | 4,730.1 |  |  | 5,234.3 |
Plus reinsurance recoverable on unpaid losses at period end | 1,611.3 |  |  | 635.8 |  |  | 1,515.2 |
Provision for losses and LAE at the end of the relevant period | $ | 6,679.4 |  |  | $ | 5,365.9 |  |  | $ | 6,749.5 |
For the three months ended March 31, 2018, there was a reduction of $37.7 million in the Company’s estimate of the ultimate claims to be paid in respect of prior accident years compared to a reduction of $26.2 million for the three months ended March 31, 2017. The Company ceded $125.5 million of reserves as part of an adverse development cover purchased during the twelve months ended December 31, 2017. For additional information on the reserve releases, please refer to “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Reserves for Losses and Loss Adjustment Expenses” below.
|  | Insurance |  |  |  |
|  | Incurred Claims, IBNR and Allocated Loss Adjustment Expenses, Net of Reinsurance |  | As at March 31, 2018
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 |  | 2017 |  | Q1 2018 |  |
|  | $ (in millions) |  |  |  |
2012 |  | 611.2 |  |  | 632.4 |  |  | 661.7 |  |  | 676.3 |  |  | 661.1 |  |  | 644.4 |  |  | 644.3 |  |  | 29.3 |  |  | 15,648 |
2013 |  |  |  | 696.7 |  |  | 674.4 |  |  | 685.3 |  |  | 667.0 |  |  | 657.0 |  |  | 654.1 |  |  | 45.1 |  |  | 14,597 |
2014 |  |  |  |  |  | 763.0 |  |  | 737.6 |  |  | 709.6 |  |  | 702.6 |  |  | 705.4 |  |  | 70.8 |  |  | 18,855 |
2015 |  |  |  |  |  |  |  | 927.6 |  |  | 918.0 |  |  | 867.2 |  |  | 871.2 |  |  | 162.7 |  |  | 21,321 |
2016 |  |  |  |  |  |  |  |  |  | 920.4 |  |  | 892.3 |  |  | 887.7 |  |  | 300.0 |  |  | 21,042 |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 907.0 |  |  | 870.6 |  |  | 232.7 |  |  | 19,494 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  | 159.8 |  |  | 113.8 |  |  | 2,636 |
|  |  |  |  |  |  |  |  |  |  |  | Total |  |  | $ | 4,793.1 |  |  |  |  |
|  | Insurance
|  | Cumulative Paid Claims and Allocated Loss Adjustment Expenses, Net of Reinsurance
|  | For the Years Ended December 31, |  |
|  | Unaudited Prior Years |  |  |  |  |  |
Accident Year |  | 2012 |  | 2013 |  | 2014 |  | 2015 |  | 2016 |  | 2017 |  | Q1 2018
|  | ($ in millions) |  |  |  |
2012 |  | 118.5 |  |  | 310.6 |  |  | 382.2 |  |  | 457.5 |  |  | 508.0 |  |  | 530.2 |  |  | 532.0 |
2013 |  |  |  | 92.1 |  |  | 257.3 |  |  | 368.5 |  |  | 459.4 |  |  | 507.9 |  |  | 524.1 |
2014 |  |  |  |  |  | 100.2 |  |  | 249.8 |  |  | 393.1 |  |  | 470.4 |  |  | 479.1 |
2015 |  |  |  |  |  |  |  | 120.4 |  |  | 331.4 |  |  | 478.2 |  |  | 508.4 |
2016 |  |  |  |  |  |  |  |  |  | 118.7 |  |  | 349.9 |  |  | 399.9 |
2017 |  |  |  |  |  |  |  |  |  |  |  | 169.4 |  |  | 261.6 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.0 |
|  |  |  |  |  |  |  |  |  |  |  |  | Total |  |  |  |  | $ | 2,710.1 |
|  | All outstanding liabilities for 2012 and subsequent years, net of reinsurance |  |  | $ | 2,083.0 |
|  |  |  | All outstanding liabilities before 2012, net of reinsurance |  |  | 131.1 |
|  |  |  | Liabilities for claims and claim adjustment expenses, net of reinsurance |  |  | $ | 2,214.1 |
|  | Reinsurance |  |  |  |
|  | Incurred Claims, IBNR and Allocated Loss Adjustment Expenses, Net of Reinsurance |  | As at March 31, 2018
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 |  | 2017 |  | Q1 2018 |  |
|  | $ (in millions) |  |  |  |
2012 |  | 699.0 |  |  | 743.7 |  |  | 727.2 |  |  | 698.0 |  |  | 696.9 |  |  | 695.1 |  |  | 692.2 |  |  | 79.7 |  |  | 3,791 |
2013 |  |  |  | 588.2 |  |  | 581.4 |  |  | 560.5 |  |  | 533.9 |  |  | 514.3 |  |  | 513.2 |  |  | 72.6 |  |  | 3,641 |
2014 |  |  |  |  |  | 557.6 |  |  | 539.1 |  |  | 523.1 |  |  | 495.7 |  |  | 486.4 |  |  | 94.9 |  |  | 3,614 |
2015 |  |  |  |  |  |  |  | 590.3 |  |  | 574.7 |  |  | 568.1 |  |  | 562.4 |  |  | 142.0 |  |  | 3,770 |
2016 |  |  |  |  |  |  |  |  |  | 761.4 |  |  | 775.5 |  |  | 775.0 |  |  | 234.8 |  |  | 3,492 |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,204.4 |  |  | 1,213.1 |  |  | 483.7 |  |  | 3,240 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  | 176.5 |  |  | 148.0 |  |  | 1,010 |
|  |  |  |  |  |  |  |  |  |  | Total |  |  |  |  |  |  | $ | 4,418.8 |  |  |  |  |
|  | Reinsurance
|  | Cumulative Paid Claims and Allocated Loss Adjustment Expenses, Net of Reinsurance
|  | For the Years Ended December 31, |  |
|  | Unaudited Prior Years |  |  |  |  |  |
Accident Year |  | 2012 |  | 2013 |  | 2014 |  | 2015 |  | 2016 |  | 2017 |  | Q1 2018
|  | ($ in millions) |  |  |  |
2012 |  | 64.0 |  |  | 251.4 |  |  | 364.8 |  |  | 419.2 |  |  | 463.4 |  |  | 501.5 |  |  | 508.0 |
2013 |  |  |  | 64.2 |  |  | 190.9 |  |  | 284.0 |  |  | 326.3 |  |  | 366.6 |  |  | 373.3 |
2014 |  |  |  |  |  | 57.8 |  |  | 175.5 |  |  | 252.3 |  |  | 293.7 |  |  | 302.1 |
2015 |  |  |  |  |  |  |  | 58.1 |  |  | 174.6 |  |  | 276.9 |  |  | 297.9 |
2016 |  |  |  |  |  |  |  |  |  | 126.9 |  |  | 355.5 |  |  | 372.4 |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 229.3 |  |  | 415.8 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.4 |
|  |  |  |  |  |  |  |  |  |  |  |  | Total |  |  |  |  | $ | 2,271.9 |
|  | All outstanding liabilities for 2012 and subsequent years, net of reinsurance |  |  |  |  | 2,146.9 |
|  |  |  | All outstanding liabilities before 2012, net of reinsurance |  |  |  |  | 660.0 |
|  |  |  | Liabilities for claims and claim adjustment expenses, net of reinsurance |  |  |  |  | $ | 2,806.9 |
| Three Months Ended March 31, 2018
| ($ in millions)
Net outstanding liabilities: |
Insurance lines | 2,214.1 |
Reinsurance lines | 2,806.9 |
Net loss and LAE | 5,021.0 |
Reinsurance recoverable on unpaid losses: |
Insurance lines | 1,304.3 |
Reinsurance lines | 307.0 |
Total reinsurance recoverable on unpaid losses | 1,611.3 |
Insurance lines other than short-duration | — |
Unallocated claims incurred | 48.8 |
Other | (1.7 | )
| 47.1 |
Provision for losses and LAE at the end of the period | 6,679.4 |

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