XML 84 R86.htm IDEA: XBRL DOCUMENT
v3.20.1

Reserves for Losses and Adjustment Expenses Short-duration Insurance Contracts, Claims by Accident Year (Details) $ in Millions | Dec. 31, 2019 USD ($) Integer | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Claims Development [Line Items] |  |  |  |  |  |  |  |
Liability for claims and claim adjustment expenses, net of reinsurance | $ 4,815.5 |  |  |  |  |  |  |
Property Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 1,432.2 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | 1,245.6 |  |  |  |  |  |  |
All outstanding liabilities for 2012 and subsequent years, net of reinsurance | 186.6 |  |  |  |  |  |  |
All outstanding liabilities before 2012, net of reinsurance | 4.1 |  |  |  |  |  |  |
Liability for claims and claim adjustment expenses, net of reinsurance | 190.7 |  |  |  |  |  |  |
Casualty Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 1,173.3 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | 546.1 |  |  |  |  |  |  |
All outstanding liabilities for 2012 and subsequent years, net of reinsurance | 627.2 |  |  |  |  |  |  |
All outstanding liabilities before 2012, net of reinsurance | 42.0 |  |  |  |  |  |  |
Liability for claims and claim adjustment expenses, net of reinsurance | 669.2 |  |  |  |  |  |  |
Marine, Aviation and Energy Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 2,070.6 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | 1,490.7 |  |  |  |  |  |  |
All outstanding liabilities for 2012 and subsequent years, net of reinsurance | 579.9 |  |  |  |  |  |  |
All outstanding liabilities before 2012, net of reinsurance | 11.6 |  |  |  |  |  |  |
Liability for claims and claim adjustment expenses, net of reinsurance | 591.5 |  |  |  |  |  |  |
Financial and Professional Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 1,310.5 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | 670.4 |  |  |  |  |  |  |
All outstanding liabilities for 2012 and subsequent years, net of reinsurance | 640.1 |  |  |  |  |  |  |
All outstanding liabilities before 2012, net of reinsurance | 17.3 |  |  |  |  |  |  |
Liability for claims and claim adjustment expenses, net of reinsurance | 657.4 |  |  |  |  |  |  |
Property Catastrophe and Other Property Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 2,195.6 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | 1,687.6 |  |  |  |  |  |  |
All outstanding liabilities for 2012 and subsequent years, net of reinsurance | 508.0 |  |  |  |  |  |  |
All outstanding liabilities before 2012, net of reinsurance | 20.6 |  |  |  |  |  |  |
Liability for claims and claim adjustment expenses, net of reinsurance | 528.6 |  |  |  |  |  |  |
Casualty Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 1,867.4 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | 666.1 |  |  |  |  |  |  |
All outstanding liabilities for 2012 and subsequent years, net of reinsurance | 1,201.2 |  |  |  |  |  |  |
All outstanding liabilities before 2012, net of reinsurance | 401.0 |  |  |  |  |  |  |
Liability for claims and claim adjustment expenses, net of reinsurance | 1,602.2 |  |  |  |  |  |  |
Specialty Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 2,045.3 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | 1,499.4 |  |  |  |  |  |  |
All outstanding liabilities for 2012 and subsequent years, net of reinsurance | 545.9 |  |  |  |  |  |  |
All outstanding liabilities before 2012, net of reinsurance | 30.0 |  |  |  |  |  |  |
Liability for claims and claim adjustment expenses, net of reinsurance | 575.9 |  |  |  |  |  |  |
Accident Year 2012 | Property Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 153.0 | 153.0 | $ 154.0 | $ 159.9 | $ 165.5 | $ 166.6 | $ 167.9 | $ 169.8
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 0.0 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 6,075 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 153.6 | 153.6 | 154.3 | 156.8 | 152.7 | 138.7 | 129.1 | 41.3
Accident Year 2012 | Casualty Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 70.5 | 68.6 | 66.6 | 69.0 | 61.1 | 70.0 | 62.8 | 78.0
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 8.0 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 2,951 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 54.7 | 50.1 | 49.3 | 40.9 | 29.7 | 14.2 | 6.6 | 1.3
Accident Year 2012 | Marine, Aviation and Energy Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 310.9 | 316.2 | 327.9 | 331.8 | 346.2 | 325.5 | 306.0 | 268.5
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 7.0 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 3,808 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 274.4 | 273.5 | 250.6 | 239.7 | 210.9 | 174.7 | 132.2 | 51.3
Accident Year 2012 | Financial and Professional Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 95.8 | 100.8 | 89.1 | 93.5 | 96.5 | 93.1 | 89.5 | 88.0
Incurred but Not Reported (IBNR) Claims Liability, Net | $ (1.6) |  |  |  |  |  |  |
Number of Reported Claims | Integer | 580 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 84.8 | 79.7 | 70.3 | 65.1 | 59.1 | 50.6 | 39.5 | 22.8
Accident Year 2012 | Property Catastrophe and Other Property Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 262.0 | 272.1 | 279.6 | 282.6 | 279.2 | 286.6 | 303.5 | 280.3
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 8.5 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 664 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 242.5 | 232.4 | 227.9 | 216.8 | 209.3 | 189.1 | 136.0 | 35.7
Accident Year 2012 | Casualty Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 244.1 | 241.5 | 232.6 | 231.6 | 234.6 | 243.3 | 232.0 | 233.8
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 34.1 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 1,770 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 143.8 | 134.1 | 117.4 | 96.2 | 65.3 | 41.9 | 17.7 | 2.2
Accident Year 2012 | Specialty Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 167.1 | 169.5 | 172.9 | 172.3 | 173.9 | 188.3 | 199.2 | 175.8
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 5.4 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 638 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 153.3 | 150.5 | 149.2 | 143.9 | 138.5 | 128.5 | 93.4 | $ 24.9
Accident Year 2013 | Property Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 111.9 | 111.6 | 113.6 | 112.6 | 116.9 | 117.2 | 130.0 |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 0.4 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 5,759 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 110.2 | 108.4 | 105.7 | 101.1 | 89.1 | 75.9 | 38.9 |
Accident Year 2013 | Casualty Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 104.8 | 104.6 | 103.4 | 120.4 | 114.9 | 116.5 | 132.9 |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 10.8 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 3,239 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 85.1 | 80.8 | 68.4 | 53.0 | 39.5 | 25.8 | 2.2 |
Accident Year 2013 | Marine, Aviation and Energy Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 345.1 | 346.4 | 332.9 | 325.8 | 342.3 | 333.7 | 320.8 |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 5.2 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 4,171 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 300.4 | 284.3 | 264.7 | 235.3 | 204.9 | 131.6 | 41.5 |
Accident Year 2013 | Financial and Professional Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 90.3 | 91.3 | 100.2 | 101.2 | 104.5 | 100.1 | 105.6 |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 7.7 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 572 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 74.5 | 72.4 | 63.8 | 65.4 | 31.2 | 21.1 | 8.1 |
Accident Year 2013 | Property Catastrophe and Other Property Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 170.3 | 173.2 | 176.5 | 178.0 | 189.2 | 199.1 | 216.7 |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 0.4 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 822 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 166.0 | 164.5 | 163.0 | 158.3 | 146.3 | 98.3 | 34.4 |
Accident Year 2013 | Casualty Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 203.3 | 200.6 | 205.4 | 222.3 | 225.0 | 229.7 | 214.5 |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 39.6 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 1,648 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 127.3 | 114.6 | 92.7 | 64.8 | 42.6 | 15.8 | 3.4 |
Accident Year 2013 | Specialty Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 114.9 | 115.1 | 118.9 | 119.7 | 131.5 | 139.3 | 144.1 |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 4.8 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 574 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 102.0 | 101.1 | 101.1 | 94.1 | 86.8 | 70.8 | $ 25.0 |
Accident Year 2014 | Property Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 132.6 | 134.1 | 134.9 | 134.2 | 157.3 | 165.4 |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 1.5 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 9,989 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 129.3 | 127.9 | 123.8 | 114.1 | 86.6 | 40.4 |  |
Accident Year 2014 | Casualty Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 140.4 | 136.3 | 129.2 | 139.0 | 127.2 | 144.9 |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 24.8 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 3,723 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 97.3 | 73.2 | 59.8 | 32.7 | 13.4 | 2.7 |  |
Accident Year 2014 | Marine, Aviation and Energy Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 313.0 | 306.1 | 310.6 | 298.9 | 314.1 | 309.8 |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 11.6 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 4,027 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 250.9 | 232.7 | 210.0 | 189.3 | 116.8 | 53.5 |  |
Accident Year 2014 | Financial and Professional Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 120.1 | 131.1 | 119.8 | 129.5 | 130.9 | 135.0 |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 12.4 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 788 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 85.5 | 79.7 | 72.2 | 53.5 | 30.7 | 3.0 |  |
Accident Year 2014 | Property Catastrophe and Other Property Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 146.0 | 150.9 | 150.5 | 161.8 | 177.7 | 190.3 |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 2.2 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 905 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 140.5 | 141.8 | 137.8 | 127.8 | 101.1 | 37.6 |  |
Accident Year 2014 | Casualty Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 205.9 | 203.2 | 209.6 | 216.2 | 207.7 | 205.0 |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 44.3 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 1,732 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 107.4 | 86.4 | 60.2 | 37.8 | 13.8 | 2.5 |  |
Accident Year 2014 | Specialty Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 124.3 | 125.8 | 123.0 | 132.1 | 140.2 | 152.0 |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 8.1 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 621 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 102.4 | 99.5 | 89.2 | 81.1 | 56.3 | $ 16.6 |  |
Accident Year 2015 | Property Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 203.1 | 202.6 | 200.3 | 205.8 | 240.2 |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 2.6 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 11,597 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 196.4 | 179.9 | 170.8 | 142.9 | 57.3 |  |  |
Accident Year 2015 | Casualty Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 236.7 | 203.9 | 186.2 | 223.6 | 203.6 |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 38.7 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 4,577 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 138.8 | 92.9 | 56.6 | 17.1 | 3.2 |  |  |
Accident Year 2015 | Marine, Aviation and Energy Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 310.0 | 286.5 | 282.5 | 300.3 | 297.3 |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 24.9 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 4,030 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 222.2 | 194.2 | 174.4 | 123.4 | 44.9 |  |  |
Accident Year 2015 | Financial and Professional Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 191.0 | 189.8 | 185.6 | 175.6 | 174.2 |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 47.7 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 1,077 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 110.0 | 89.4 | 70.1 | 43.5 | 13.8 |  |  |
Accident Year 2015 | Property Catastrophe and Other Property Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 172.0 | 156.7 | 177.2 | 187.3 | 214.5 |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 6.5 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 1,031 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 156.2 | 139.2 | 126.9 | 95.1 | 35.9 |  |  |
Accident Year 2015 | Casualty Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 210.9 | 213.3 | 210.7 | 201.2 | 194.3 |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 56.3 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 1,832 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 89.4 | 65.5 | 38.4 | 18.0 | 3.5 |  |  |
Accident Year 2015 | Specialty Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 157.9 | 159.1 | 164.8 | 170.2 | 166.3 |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 11.1 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 765 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 131.4 | 122.1 | 104.2 | 56.4 | $ 17.7 |  |  |
Accident Year 2016 | Property Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 245.8 | 244.5 | 249.6 | 238.8 |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 7.4 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 10,738 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 223.7 | 201.6 | 169.0 | 67.0 |  |  |  |
Accident Year 2016 | Casualty Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 190.4 | 183.8 | 188.5 | 217.4 |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 70.4 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 4,509 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 82.8 | 40.3 | 22.9 | 4.2 |  |  |  |
Accident Year 2016 | Marine, Aviation and Energy Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 229.3 | 229.1 | 230.5 | 260.6 |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 26.6 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 4,368 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 164.1 | 142.5 | 82.6 | 30.9 |  |  |  |
Accident Year 2016 | Financial and Professional Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 202.2 | 216.5 | 211.8 | 191.0 |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 61.5 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 1,238 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 130.1 | 102.1 | 71.2 | 15.1 |  |  |  |
Accident Year 2016 | Property Catastrophe and Other Property Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 248.1 | 269.8 | 271.5 | 271.6 |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 8.2 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 1,278 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 216.4 | 205.4 | 164.2 | 57.0 |  |  |  |
Accident Year 2016 | Casualty Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 255.6 | 245.6 | 245.9 | 233.4 |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 89.0 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 1,759 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 96.3 | 64.2 | 33.6 | 9.3 |  |  |  |
Accident Year 2016 | Specialty Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 230.8 | 238.4 | 240.3 | 239.3 |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 23.2 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 916 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 183.9 | 165.8 | 151.0 | $ 58.8 |  |  |  |
Accident Year 2017 | Property Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 252.2 | 259.0 | 296.1 |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 10.3 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 9,532 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 222.0 | 188.9 | 96.6 |  |  |  |  |
Accident Year 2017 | Casualty Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 179.0 | 175.0 | 181.6 |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 35.3 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 5,022 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 53.0 | 23.0 | 3.6 |  |  |  |  |
Accident Year 2017 | Marine, Aviation and Energy Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 207.3 | 201.0 | 210.7 |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 17.2 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 5,894 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 140.3 | 97.7 | 40.2 |  |  |  |  |
Accident Year 2017 | Financial and Professional Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 187.9 | 183.1 | 206.8 |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 70.9 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 1,688 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 83.4 | 51.3 | 27.2 |  |  |  |  |
Accident Year 2017 | Property Catastrophe and Other Property Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 516.6 | 534.7 | 557.7 |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 10.0 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 1,952 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 416.9 | 357.8 | 123.3 |  |  |  |  |
Accident Year 2017 | Casualty Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 253.6 | 242.9 | 245.2 |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 129.0 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 1,474 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 59.1 | 30.6 | 8.9 |  |  |  |  |
Accident Year 2017 | Specialty Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 376.1 | 392.6 | 379.9 |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 51.0 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 1,303 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 270.9 | 238.9 | $ 94.8 |  |  |  |  |
Accident Year 2018 | Property Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 206.3 | 203.7 |  |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 18.4 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 7,913 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 161.1 | 62.2 |  |  |  |  |  |
Accident Year 2018 | Casualty Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 125.9 | 123.0 |  |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 57.7 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 4,938 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 28.0 | 3.2 |  |  |  |  |  |
Accident Year 2018 | Marine, Aviation and Energy Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 208.5 | 171.3 |  |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 33.9 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 4,839 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 104.9 | 26.8 |  |  |  |  |  |
Accident Year 2018 | Financial and Professional Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 173.5 | 157.6 |  |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 69.1 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 4,644 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 74.8 | 20.3 |  |  |  |  |  |
Accident Year 2018 | Property Catastrophe and Other Property Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 406.8 | 349.9 |  |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 14.2 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 1,769 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 320.6 | 122.8 |  |  |  |  |  |
Accident Year 2018 | Casualty Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 258.7 | 229.2 |  |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 166.9 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 1,051 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 33.6 | 7.2 |  |  |  |  |  |
Accident Year 2018 | Specialty Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 397.5 | 398.4 |  |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 67.3 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 1,282 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 281.2 | $ 27.3 |  |  |  |  |  |
Accident Year 2019 | Property Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 127.3 |  |  |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 42.4 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 5,291 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 49.3 |  |  |  |  |  |  |
Accident Year 2019 | Casualty Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 125.6 |  |  |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 89.2 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 3,625 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 6.4 |  |  |  |  |  |  |
Accident Year 2019 | Marine, Aviation and Energy Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 146.5 |  |  |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 67.7 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 2,532 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 33.5 |  |  |  |  |  |  |
Accident Year 2019 | Financial and Professional Insurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 249.7 |  |  |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 195.9 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 10,797 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 27.3 |  |  |  |  |  |  |
Accident Year 2019 | Property Catastrophe and Other Property Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 273.8 |  |  |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 117.4 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 974 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 28.5 |  |  |  |  |  |  |
Accident Year 2019 | Casualty Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 235.3 |  |  |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 207.6 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 375 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 9.2 |  |  |  |  |  |  |
Accident Year 2019 | Specialty Reinsurance |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expense, Net | 476.7 |  |  |  |  |  |  |
Incurred but Not Reported (IBNR) Claims Liability, Net | $ 154.6 |  |  |  |  |  |  |
Number of Reported Claims | Integer | 1,080 |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expense, Net | $ 274.3 |  |  |  |  |  |  |

X
- Definition Undiscounted subtotal amount, after reinsurance, of the liability for unpaid claim adjustment expense for short durations insurance contracts not separately presented in claim development information. + References No definition available. + Details
Name: | ahl_ShortDurationInsuranceContractsLiabilityforUnpaidClaimAdjustmentExpenseNetNotSeparatelyPresentedSubtotal
Namespace Prefix: | ahl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ClaimsDevelopmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after reinsurance, of paid claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671311-158438 + Details
Name: | us-gaap_ShortdurationInsuranceContractsCumulativePaidClaimsAndAllocatedClaimAdjustmentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671321-158438 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4D -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671317-158438 + Details
Name: | us-gaap_ShortdurationInsuranceContractsIncurredButNotReportedIbnrClaimsLiabilityNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Undiscounted amount, after reinsurance, of incurred claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671311-158438 + Details
Name: | us-gaap_ShortdurationInsuranceContractsIncurredClaimsAndAllocatedClaimAdjustmentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671315-158438 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671311-158438 + Details
Name: | us-gaap_ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndAllocatedClaimAdjustmentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts for accident years not separately presented in claim development information. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671311-158438 + Details
Name: | us-gaap_ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndAllocatedClaimAdjustmentExpenseNetNotSeparatelyPresented
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Cumulative number of reported claims for short-duration insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671317-158438 + Details
Name: | us-gaap_ShortdurationInsuranceContractsNumberOfReportedClaims
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_PropertyInsuranceProductLineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=ahl_CasualtyCommercialInsuranceProductLineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=ahl_MarineAviationandEnergyCommercialInsuranceProductLineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=ahl_FinancialandProfessionalCommercialInsuranceProductLineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=ahl_AssumedPropertyCatastropheandOtherPropertyCommercialInsuranceProductLineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=ahl_AssumedCasualtyCommercialInsuranceProductLineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=ahl_AssumedSpecialtyCommercialInsuranceProductLineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortdurationInsuranceContractsAccidentYearAxis=us-gaap_ShortdurationInsuranceContractsAccidentYear2012Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortdurationInsuranceContractsAccidentYearAxis=us-gaap_ShortdurationInsuranceContractsAccidentYear2013Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortdurationInsuranceContractsAccidentYearAxis=us-gaap_ShortdurationInsuranceContractsAccidentYear2014Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortdurationInsuranceContractsAccidentYearAxis=us-gaap_ShortdurationInsuranceContractsAccidentYear2015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortdurationInsuranceContractsAccidentYearAxis=us-gaap_ShortdurationInsuranceContractsAccidentYear2016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortdurationInsuranceContractsAccidentYearAxis=us-gaap_ShortDurationInsuranceContractsAccidentYear2017Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortdurationInsuranceContractsAccidentYearAxis=us-gaap_ShortDurationInsuranceContractsAccidentYear2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortdurationInsuranceContractsAccidentYearAxis=us-gaap_ShortDurationInsuranceContractAccidentYear2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |