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Reserves for Losses and Adjustment Expenses (Tables) | 12 Months Ended
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Dec. 31, 2017
Insurance [Abstract] |
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense | The following table represents a reconciliation of beginning and ending consolidated loss and LAE reserves for the twelve months ended December 31, 2017, 2016 and 2015:
|  | As at December 31,
|  | 2017 |  | 2016 |  | 2015
|  | ($ in millions)
Provision for losses and LAE at the start of the year |  | $ | 5,319.9 |  |  | $ | 4,938.2 |  |  | $ | 4,750.8 |
Less reinsurance recoverable |  | (560.7 | ) |  | (354.8 | ) |  | (350.0 | )
Net loss and LAE at the start of the year |  | 4,759.2 |  |  | 4,583.4 |  |  | 4,400.8 |
Net loss and LAE expenses (disposed) |  | (125.5 | ) |  | (80.1 | ) |  | — |
Movement in provision for losses and LAE for claims incurred: |  |  |  |  |  |
Current year |  | 2,100.1 |  |  | 1,705.4 |  |  | 1,522.7 |
Prior years |  | (105.4 | ) |  | (129.3 | ) |  | (156.5 | )
Total incurred |  | 1,994.7 |  |  | 1,576.1 |  |  | 1,366.2 |
Losses and LAE payments for claims incurred: |  |  |  |  |  |
Current year |  | (397.5 | ) |  | (241.0 | ) |  | (178.8 | )
Prior years |  | (1,157.6 | ) |  | (981.8 | ) |  | (929.7 | )
Total paid |  | (1,555.1 | ) |  | (1,222.8 | ) |  | (1,108.5 | )
Foreign exchange losses/(gains) |  | 161.0 |  |  | (97.4 | ) |  | (75.1 | )
Net losses and LAE reserves at the end of the year |  | 5,234.3 |  |  | 4,759.2 |  |  | 4,583.4 |
Plus reinsurance recoverable on unpaid losses at the end of the year |  | 1,515.2 |  |  | 560.7 |  |  | 354.8 |
Provision for losses and LAE at the end of the year |  | $ | 6,749.5 |  |  | $ | 5,319.9 |  |  | $ | 4,938.2 |
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 December 31, 2017, 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.
|  | Property Insurance Lines |  |  |  |
|  | Incurred Claims, IBNR and Loss Adjustment Expenses, Net of Reinsurance |  | As at December 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 |  | 2017 |  |
|  | $ (in millions) |  |  |  |
2012 |  | 170.7 |  |  | 168.6 |  |  | 167.3 |  |  | 166.2 |  |  | 160.6 |  |  | 154.7 |  |  | 0.3 |  |  | 6,872 |
2013 |  |  |  | 130.8 |  |  | 117.9 |  |  | 117.5 |  |  | 113.3 |  |  | 114.3 |  |  | 4.9 |  |  | 5,100 |
2014 |  |  |  |  |  | 166.2 |  |  | 157.9 |  |  | 134.7 |  |  | 135.4 |  |  | 3.0 |  |  | 8,779 |
2015 |  |  |  |  |  |  |  | 241.9 |  |  | 207.3 |  |  | 201.8 |  |  | 4.7 |  |  | 10,431 |
2016 |  |  |  |  |  |  |  |  |  | 239.9 |  |  | 250.7 |  |  | 14.7 |  |  | 9,514 |
2017 |  |  |  |  |  |  |  |  |  |  |  | 297.7 |  |  | 51.3 |  |  | 6,249 |
|  |  |  |  |  |  |  |  |  |  |  |  | Total |  |  | $ | 1,154.6 |  |  |  |  |
|  | Property Insurance Lines
|  | 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
|  | ($ in millions)
2012 |  | 41.5 |  |  | 129.6 |  |  | 139.2 |  |  | 153.4 |  |  | 157.5 |  |  | 154.9 |
2013 |  |  |  | 39.2 |  |  | 76.4 |  |  | 89.7 |  |  | 101.8 |  |  | 106.4 |
2014 |  |  |  |  |  | 40.5 |  |  | 87.0 |  |  | 114.5 |  |  | 124.2 |
2015 |  |  |  |  |  |  |  | 57.5 |  |  | 144.0 |  |  | 172.1 |
2016 |  |  |  |  |  |  |  |  |  | 67.3 |  |  | 169.7 |
2017 |  |  |  |  |  |  |  |  |  |  |  | 97.2 |
|  |  |  |  |  |  |  |  |  |  |  | $ | 824.5 |
|  |  |  | All outstanding liabilities for 2012 and subsequent years, net of reinsurance |  |  | $ | 330.1 |
|  |  |  |  |  | All outstanding liabilities before 2012, net of reinsurance |  |  | 2.9 |
|  |  |  | Liabilities for claims and claim adjustment expenses, net of reinsurance |  |  | $ | 333.0 |
|  | Casualty Insurance Lines |  |  |  |
|  | Incurred Claims, IBNR and Loss Adjustment Expenses, Net of Reinsurance |  | As at December 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 |  | 2017 |  |
|  | $ (in millions) |  |  |  |
2012 |  | 78.6 |  |  | 63.4 |  |  | 70.5 |  |  | 61.7 |  |  | 69.6 |  |  | 67.2 |  |  | 5.2 |  |  | 3,536 |
2013 |  |  |  | 134.1 |  |  | 117.5 |  |  | 115.9 |  |  | 121.4 |  |  | 104.4 |  |  | 13.6 |  |  | 3,852 |
2014 |  |  |  |  |  | 146.4 |  |  | 128.6 |  |  | 140.5 |  |  | 130.9 |  |  | 20.4 |  |  | 4,312 |
2015 |  |  |  |  |  |  |  | 205.5 |  |  | 225.5 |  |  | 188.0 |  |  | 64.7 |  |  | 4,954 |
2016 |  |  |  |  |  |  |  |  |  | 219.4 |  |  | 190.6 |  |  | 117.9 |  |  | 5,084 |
2017 |  |  |  |  |  |  |  |  |  |  |  | 183.4 |  |  | 153.0 |  |  | 4,447 |
|  |  |  |  |  |  |  |  |  |  |  |  | Total |  |  | $ | 864.5 |  |  |  |  |
|  | Casualty Insurance Lines
|  | 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
|  | ($ in millions)
2012 |  | 1.3 |  |  | 6.7 |  |  | 14.3 |  |  | 30.0 |  |  | 41.3 |  |  | 49.7 |
2013 |  |  |  | 2.3 |  |  | 26.0 |  |  | 39.8 |  |  | 53.5 |  |  | 69.0 |
2014 |  |  |  |  |  | 2.7 |  |  | 13.6 |  |  | 33.1 |  |  | 60.4 |
2015 |  |  |  |  |  |  |  | 3.2 |  |  | 17.2 |  |  | 57.0 |
2016 |  |  |  |  |  |  |  |  |  | 4.2 |  |  | 23.1 |
2017 |  |  |  |  |  |  |  |  |  |  |  | 3.6 |
|  |  |  |  |  |  |  |  |  |  |  |  | Total |  |  | $ | 262.8 |
|  |  |  | All outstanding liabilities for 2012 and subsequent years, net of reinsurance |  |  | $ | 601.7 |
|  |  |  |  |  | All outstanding liabilities before 2012, net of reinsurance |  |  | 43.0 |
|  |  |  | Liabilities for claims and claim adjustment expenses, net of reinsurance |  |  | $ | 644.7 |
|  | Marine, Aviation and Energy Insurance Lines |  |  |  |
|  | Incurred Claims, IBNR and Loss Adjustment Expenses, Net of Reinsurance |  | As at December 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 |  | 2017 |  |
|  | $ (in millions) |  |  |  |
2012 |  | 269.8 |  |  | 307.2 |  |  | 326.7 |  |  | 347.3 |  |  | 333.0 |  |  | 329.0 |  |  | 33.8 |  |  | 4,593 |
2013 |  |  |  | 321.4 |  |  | 334.2 |  |  | 342.9 |  |  | 326.3 |  |  | 333.3 |  |  | 17.4 |  |  | 4,979 |
2014 |  |  |  |  |  | 310.1 |  |  | 314.5 |  |  | 299.3 |  |  | 310.9 |  |  | 45.3 |  |  | 4,768 |
2015 |  |  |  |  |  |  |  | 297.9 |  |  | 301.0 |  |  | 283.3 |  |  | 37.9 |  |  | 4,356 |
2016 |  |  |  |  | — |  |  |  |  |  | 219.4 |  |  | 231.9 |  |  | 49.5 |  |  | 4,572 |
2017 |  |  |  |  | — |  |  |  |  |  |  |  | 211.5 |  |  | 70.0 |  |  | 3,993 |
|  |  |  |  |  |  |  |  |  |  |  |  | Total |  |  | $ | 1,699.9 |  |  |  |  |
|  | Marine, Aviation and Energy Insurance Lines
|  | 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
|  | ($ in millions)
2012 |  | 52.2 |  |  | 133.2 |  |  | 175.7 |  |  | 212.0 |  |  | 240.8 |  |  | 251.7 |
2013 |  |  |  | 41.6 |  |  | 131.8 |  |  | 205.3 |  |  | 235.7 |  |  | 265.0 |
2014 |  |  |  |  |  | 53.6 |  |  | 117.0 |  |  | 189.5 |  |  | 210.2 |
2015 |  |  |  |  |  |  |  | 45.1 |  |  | 123.7 |  |  | 174.9 |
2016 |  |  |  |  |  |  |  |  |  | 30.9 |  |  | 83.2 |
2017 |  |  |  |  |  |  |  |  |  |  |  | 40.4 |
|  |  |  |  |  |  |  |  |  |  |  |  | Total |  |  | $ | 1,025.4 |
|  |  |  | All outstanding liabilities for 2012 and subsequent years, net of reinsurance |  |  | $ | 674.5 |
|  |  |  |  |  | All outstanding liabilities before 2012, net of reinsurance |  |  | 61.4 |
|  |  |  | Liabilities for claims and claim adjustment expenses, net of reinsurance |  |  | $ | 735.9 |
|  | Financial and Professional Insurance Lines |  |  |  |
|  | Incurred Claims, IBNR and Loss Adjustment Expenses, Net of Reinsurance |  | As at December 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 |  | 2017 |  |
|  | $ (in millions) |  |  |  |
2012 |  | 88.8 |  |  | 90.1 |  |  | 94.0 |  |  | 97.6 |  |  | 94.5 |  |  | 90.0 |  |  | 9.7 |  |  | 593 |
2013 |  |  |  | 106.6 |  |  | 101.2 |  |  | 105.6 |  |  | 102.3 |  |  | 101.6 |  |  | 15.2 |  |  | 603 |
2014 |  |  |  |  |  | 136.4 |  |  | 132.6 |  |  | 131.3 |  |  | 121.4 |  |  | 35.2 |  |  | 852 |
2015 |  |  |  |  |  |  |  | 175.9 |  |  | 177.2 |  |  | 187.2 |  |  | 76.7 |  |  | 1,138 |
2016 |  |  |  |  |  |  |  |  |  | 193.0 |  |  | 213.6 |  |  | 121.1 |  |  | 1,365 |
2017 |  |  |  |  |  |  |  |  |  |  |  | 208.6 |  |  | 159.4 |  |  | 1,743 |
|  |  |  |  |  |  |  |  |  |  |  |  | Total |  |  | $ | 922.4 |  |  |  |  |
|  | Financial and Professional Insurance Lines
|  | 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
|  | ($ in millions)
2012 |  | 22.8 |  |  | 39.6 |  |  | 50.8 |  |  | 59.5 |  |  | 65.4 |  |  | 70.7 |
2013 |  |  |  | 8.1 |  |  | 21.5 |  |  | 31.6 |  |  | 66.0 |  |  | 64.5 |
2014 |  |  |  |  |  | 3.0 |  |  | 30.9 |  |  | 54.1 |  |  | 72.8 |
2015 |  |  |  |  |  |  |  | 13.9 |  |  | 43.7 |  |  | 70.4 |
2016 |  |  |  |  |  |  |  |  |  | 15.4 |  |  | 71.7 |
2017 |  |  |  |  |  |  |  |  |  |  |  | 27.3 |
|  |  |  |  |  |  |  |  |  |  |  |  | Total |  |  | $ | 377.4 |
|  |  |  | All outstanding liabilities for 2012 and subsequent years, net of reinsurance |  |  | $ | 545.0 |
|  |  |  |  |  | All outstanding liabilities before 2012, net of reinsurance |  |  | 27.4 |
|  |  |  | Liabilities for claims and claim adjustment expenses, net of reinsurance |  |  | $ | 572.4 |
|  | Property Catastrophe and Other Property Reinsurance |  |  |  |
|  | Incurred Claims, IBNR and Loss Adjustment Expenses, Net of Reinsurance |  | As at December 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 |  | 2017 |  |
|  | $ (in millions) |  |  |  |
2012 |  | 281.3 |  |  | 304.2 |  |  | 287.2 |  |  | 280.0 |  |  | 283.4 |  |  | 280.4 |  |  | 19.3 |  |  | 797 |
2013 |  |  |  | 220.5 |  |  | 203.0 |  |  | 193.9 |  |  | 182.3 |  |  | 180.8 |  |  | 4.4 |  |  | 945 |
2014 |  |  |  |  |  | 191.7 |  |  | 180.4 |  |  | 164.0 |  |  | 152.4 |  |  | 4.1 |  |  | 1,016 |
2015 |  |  |  |  |  |  |  | 219.4 |  |  | 191.4 |  |  | 181.6 |  |  | 18.7 |  |  | 1,135 |
2016 |  |  |  |  |  |  |  |  |  | 277.9 |  |  | 277.8 |  |  | 35.1 |  |  | 1,297 |
2017 |  |  |  |  |  |  |  |  |  |  |  | 564.8 |  |  | 216.1 |  |  | 1,366 |
|  |  |  |  |  |  |  |  |  |  |  |  | Total |  |  | $ | 1,637.8 |  |  |  |  |
|  | Property Catastrophe and Other Property 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
|  | ($ in millions)
2012 |  | 35.7 |  |  | 136.2 |  |  | 189.5 |  |  | 209.9 |  |  | 217.5 |  |  | 228.6 |
2013 |  |  |  | 34.9 |  |  | 100.3 |  |  | 149.7 |  |  | 162.0 |  |  | 166.8 |
2014 |  |  |  |  |  | 37.8 |  |  | 102.3 |  |  | 129.2 |  |  | 139.4 |
2015 |  |  |  |  |  |  |  | 36.2 |  |  | 96.9 |  |  | 130.0 |
2016 |  |  |  |  |  |  |  |  |  | 58.0 |  |  | 167.2 |
2017 |  |  |  |  |  |  |  |  |  |  |  | 124.2 |
|  |  |  |  |  |  |  |  |  |  |  | Total |  |  | $ | 956.2 |
|  |  |  | All outstanding liabilities for 2012 and subsequent years, net of reinsurance |  |  | 681.6 |
|  |  |  |  |  | All outstanding liabilities before 2012, net of reinsurance |  |  | 47.9 |
|  |  |  | Liabilities for claims and claim adjustment expenses, net of reinsurance |  |  | $ | 729.5 |
|  | Casualty Reinsurance |  |  |  |
|  | Incurred Claims, IBNR and Loss Adjustment Expenses, Net of Reinsurance |  | As at December 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 |  | 2017 |  |
|  | $ (in millions) |  |  |  |
2012 |  | 236.9 |  |  | 235.2 |  |  | 246.6 |  |  | 238.0 |  |  | 234.8 |  |  | 235.6 |  |  | 66.1 |  |  | 2,173 |
2013 |  |  |  | 217.5 |  |  | 232.9 |  |  | 228.4 |  |  | 225.8 |  |  | 208.4 |  |  | 62.2 |  |  | 2,034 |
2014 |  |  |  |  |  | 208.7 |  |  | 212.0 |  |  | 220.8 |  |  | 214.0 |  |  | 84.5 |  |  | 1,842 |
2015 |  |  |  |  |  |  |  | 197.9 |  |  | 205.3 |  |  | 214.6 |  |  | 103.0 |  |  | 1,648 |
2016 |  |  |  |  |  |  |  |  |  | 237.7 |  |  | 250.5 |  |  | 156.2 |  |  | 1,151 |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  | 249.5 |  |  | 215.9 |  |  | 476 |
|  |  |  |  |  |  |  |  |  |  |  |  | Total |  |  | $ | 1,372.6 |  |  |  |  |
|  | Casualty 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
|  | ($ in millions)
2012 |  | 2.2 |  |  | 17.9 |  |  | 42.2 |  |  | 65.8 |  |  | 97.1 |  |  | 118.5 |
2013 |  |  |  | 3.5 |  |  | 16.0 |  |  | 43.2 |  |  | 65.5 |  |  | 93.7 |
2014 |  |  |  |  |  | 2.6 |  |  | 14.1 |  |  | 38.2 |  |  | 60.9 |
2015 |  |  |  |  |  |  |  | 3.6 |  |  | 18.5 |  |  | 39.2 |
2016 |  |  |  |  |  |  |  |  |  | 9.6 |  |  | 34.3 |
2017 |  |  |  |  |  |  |  |  |  |  |  | 9.1 |
|  |  |  |  |  |  |  |  |  |  |  | Total |  |  | $ | 355.7 |
|  |  |  | All outstanding liabilities for 2012 and subsequent years, net of reinsurance |  |  | 1,016.9 |
|  |  |  |  |  | All outstanding liabilities before 2012, net of reinsurance |  |  | 575.6 |
|  |  |  | Liabilities for claims and claim adjustment expenses, net of reinsurance |  |  | $ | 1,592.5 |
|  | Specialty Reinsurance |  |  |  |
|  | Incurred Claims, IBNR and Loss Adjustment Expenses, Net of Reinsurance |  | As at December 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 |  | 2017 |  |
|  | $ (in millions) |  |  |  |
2012 |  | 178.5 |  |  | 201.7 |  |  | 191.1 |  |  | 177.4 |  |  | 176.0 |  |  | 176.3 |  |  | 10.5 |  |  | 739 |
2013 |  |  |  | 146.9 |  |  | 141.9 |  |  | 134.5 |  |  | 122.5 |  |  | 121.7 |  |  | 7.7 |  |  | 620 |
2014 |  |  |  |  |  | 154.4 |  |  | 143.4 |  |  | 135.2 |  |  | 126.0 |  |  | 15.6 |  |  | 667 |
2015 |  |  |  |  |  |  |  | 169.7 |  |  | 174.3 |  |  | 168.8 |  |  | 29.4 |  |  | 826 |
2016 |  |  |  |  |  |  |  |  |  | 243.2 |  |  | 244.6 |  |  | 49.5 |  |  | 844 |
2017 |  |  |  |  |  |  |  |  |  |  |  | 385.2 |  |  | 211.6 |  |  | 763 |
|  |  |  |  |  |  |  |  |  |  |  |  | Total |  |  | $ | 1,222.6 |  |  |  |  |
|  | Specialty 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
|  | ($ in millions)
2012 |  | 25.7 |  |  | 95.8 |  |  | 131.2 |  |  | 141.4 |  |  | 146.9 |  |  | 152.2 |
2013 |  |  |  | 25.4 |  |  | 72.7 |  |  | 89.1 |  |  | 96.4 |  |  | 103.5 |
2014 |  |  |  |  |  | 17.0 |  |  | 57.9 |  |  | 83.1 |  |  | 91.3 |
2015 |  |  |  |  |  |  |  | 18.1 |  |  | 58.1 |  |  | 106.5 |
2016 |  |  |  |  |  |  |  |  |  | 59.6 |  |  | 153.1 |
2017 |  |  |  |  |  |  |  |  |  |  |  | 95.7 |
|  |  |  |  |  |  |  |  |  |  |  | Total |  |  | $ | 702.3 |
|  |  |  | All outstanding liabilities for 2012 and subsequent years, net of reinsurance |  |  | 520.3 |
|  |  |  |  |  | All outstanding liabilities before 2012, net of reinsurance |  |  | 55.4 |
|  |  |  | Liabilities for claims and claim adjustment expenses, net of reinsurance |  |  | $ | 575.7 |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability | Reconciliation of Incurred and Paid Claims Development to total Provision for Losses and LAE
| Twelve Months Ended December 31, 2017
| ($ in millions)
Net outstanding liabilities: |
Insurance lines |
- Property insurance lines | 333.0 |
- Casualty insurance lines | 644.7 |
- Marine, aviation and energy insurance lines | 735.9 |
- Financial and professional insurance lines | 572.4 |
Total insurance lines | 2,286.0 |
Reinsurance lines |
- Property catastrophe and other property reinsurance | 729.5 |
- Casualty reinsurance | 1,592.5 |
- Specialty reinsurance | 575.7 |
Total reinsurance lines | 2,897.7 |
Net loss and LAE | 5,183.7 |
Reinsurance recoverable on unpaid losses: |
Insurance lines | 1,245.9 |
Reinsurance lines | 269.3 |
Total reinsurance recoverable on unpaid losses | 1,515.2 |
Insurance lines other than short-duration | — |
Unallocated claims incurred | 49.2 |
Other | 1.4 |
| 50.6 |
Provision for losses and LAE at the end of the year | 6,749.5 |
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 |  | 6
Insurance |  | 15.4 | % |  | 25.3 | % |  | 16.3 | % |  | 12.2 | % |  | 7.6 | % |  | 3.4 | %
Reinsurance |  | 13.2 | % |  | 25.0 | % |  | 17.0 | % |  | 8.1 | % |  | 7.1 | % |  | 5.5 | %

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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 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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