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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | $ 347.2 | $ 336.3 | $ 330.6
Future policy benefits, claims and claim expenses | 7,292.3 | 7,530.5 | 7,542.6
Unearned premiums | 344.2 | 300.9 | 266.1
Other policy claims and benefits payable | 995.7 | 916.0 | 809.3
Premium revenue/ premium earned | 1,146.0 | 1,057.1 | 1,027.7
Net investment income | 445.7 | 444.8 | 400.9
Benefits, claims and settlement expenses | 960.9 | 974.8 | 920.4
Amortization of deferred policy acquisition costs | 111.1 | 101.2 | 88.2
Other operating expenses | 394.6 | 362.6 | 356.5
Net premiums written (excluding life) | 1,063.6 | 909.3 | 860.2
Property & Casualty |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 34.4 | 29.3 | 24.6
Future policy benefits, claims and claim expenses | 420.6 | 416.9 | 388.7
Unearned premiums | 340.7 | 297.9 | 259.1
Other policy claims and benefits payable | 0.0 | 0.0 | 0.0
Premium revenue/ premium earned | 736.5 | 645.5 | 608.2
Net investment income | 46.0 | 37.9 | 31.4
Benefits, claims and settlement expenses | 521.0 | 557.0 | 534.3
Amortization of deferred policy acquisition costs | 84.6 | 71.3 | 64.3
Other operating expenses | 115.8 | 103.3 | 102.6
Net premiums written (excluding life) | 779.3 | 684.4 | 617.5
Life & Retirement |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 301.4 | 297.7 | 299.5
Future policy benefits, claims and claim expenses | 6,222.7 | 6,418.2 | 6,413.7
Unearned premiums | 0.0 | 0.0 | 4.0
Other policy claims and benefits payable | 880.8 | 816.0 | 719.8
Premium revenue/ premium earned | 154.6 | 151.8 | 144.0
Net investment income | 363.6 | 369.9 | 338.3
Benefits, claims and settlement expenses | 336.4 | 325.1 | 293.6
Amortization of deferred policy acquisition costs | 24.6 | 28.0 | 23.0
Other operating expenses | 110.0 | 99.0 | 108.2
Net premiums written (excluding life) | 29.7 | 29.2 | 29.5
Supplemental & Group Benefits |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 11.4 | 9.3 | 6.5
Future policy benefits, claims and claim expenses | 649.0 | 695.4 | 740.2
Unearned premiums | 3.5 | 3.0 | 3.0
Other policy claims and benefits payable | 114.9 | 100.0 | 89.5
Premium revenue/ premium earned | 254.9 | 259.8 | 275.5
Net investment income | 38.1 | 38.9 | 33.3
Benefits, claims and settlement expenses | 83.5 | 92.7 | 92.5
Amortization of deferred policy acquisition costs | 1.9 | 1.9 | 0.9
Other operating expenses | 124.9 | 123.2 | 118.1
Net premiums written (excluding life) | 254.6 | 195.7 | 213.2
Other, including consolidating eliminations | Eliminations |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Net investment income | (2.0) | (1.9) | (2.1)
Benefits, claims and settlement expenses | 20.0 |  |
Other operating expenses | $ 43.9 | $ 37.1 | $ 27.6

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