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Schedule III and VI Supplementary Insurance Information Supplemental Information Concerning Property and Casualty Insurance Operations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | $ 336.3 | $ 330.6 | $ 324.4
Future policy benefits, claims and claim expenses | 7,530.5 | 7,542.6 | 7,477.4
Unearned premiums | 300.9 | 266.1 | 255.7
Other policy claims and benefits payable | 916.0 | 809.3 | 945.9
Premium revenue/ premium earned | 1,057.1 | 1,027.7 | 888.8
Net investment income | 444.8 | 400.9 | 422.5
Benefits, claims and settlement expenses | 974.8 | 920.4 | 750.7
Amortization of deferred policy acquisition costs | 101.2 | 88.2 | 90.6
Other operating expenses | 362.6 | 356.5 | 277.9
Net premiums written (excluding life) | 909.3 | 860.2 | 731.7
Property & Casualty |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 29.3 | 24.6 | 24.4
Future policy benefits, claims and claim expenses | 416.9 | 388.7 | 367.4
Unearned premiums | 297.9 | 259.1 | 249.8
Other policy claims and benefits payable | 0.0 | 0.0 | 0.0
Premium revenue/ premium earned | 645.5 | 608.2 | 617.4
Net investment income | 37.9 | 31.4 | 61.1
Benefits, claims and settlement expenses | 557.0 | 534.3 | 447.9
Amortization of deferred policy acquisition costs | 71.3 | 64.3 | 67.7
Other operating expenses | 103.3 | 102.6 | 97.2
Net premiums written (excluding life) | 684.4 | 617.5 | 607.8
Life & Retirement |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 297.7 | 299.5 | 295.1
Future policy benefits, claims and claim expenses | 6,418.2 | 6,413.7 | 6,714.6
Unearned premiums | 0.0 | 4.0 | 2.8
Other policy claims and benefits payable | 816.0 | 719.8 | 873.4
Premium revenue/ premium earned | 151.8 | 144.0 | 143.4
Net investment income | 369.9 | 338.3 | 338.6
Benefits, claims and settlement expenses | 325.1 | 293.6 | 269.7
Amortization of deferred policy acquisition costs | 28.0 | 23.0 | 22.1
Other operating expenses | 99.0 | 108.2 | 102.0
Net premiums written (excluding life) | 29.2 | 29.5 | 30.6
Supplemental & Group Benefits |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 9.3 | 6.5 | 4.9
Future policy benefits, claims and claim expenses | 695.4 | 740.2 | 395.4
Unearned premiums | 3.0 | 3.0 | 3.1
Other policy claims and benefits payable | 100.0 | 89.5 | 72.5
Premium revenue/ premium earned | 259.8 | 275.5 | 128.0
Net investment income | 38.9 | 33.3 | 25.2
Benefits, claims and settlement expenses | 92.7 | 92.5 | 33.1
Amortization of deferred policy acquisition costs | 1.9 | 0.9 | 0.8
Other operating expenses | 123.2 | 118.1 | 54.3
Net premiums written (excluding life) | 195.7 | 213.2 | 93.3
Other, including consolidating eliminations | Eliminations |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Net investment income | (1.9) | (2.1) | (2.4)
Other operating expenses | $ 37.1 | $ 27.6 | $ 24.4

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