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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | $ 433.1 | $ 248.0 | $ 229.8
Future policy benefits, claims and claim expenses | 7,553.1 | 7,003.7 | 6,884.1
Unearned premiums | 264.2 | 255.1 | 264.5
Other policy claims and benefits payable | 954.0 | 945.9 | 751.3
Premium revenue/ premium earned | 1,029.0 | 889.6 | 930.7
Net investment income | 400.9 | 422.5 | 357.6
Benefits, claims and settlement expenses | 939.2 | 782.1 | 773.5
Amortization of deferred policy acquisition costs | 98.7 | 94.7 | 99.9
Other operating expenses | 356.9 | 278.4 | 277.4
Property & Casualty |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 24.5 | 24.4 | 26.1
Future policy benefits, claims and claim expenses | 388.7 | 362.4 | 372.1
Unearned premiums | 259.1 | 249.8 | 259.4
Other policy claims and benefits payable | 0.0 | 0.0 | 0.0
Premium revenue/ premium earned | 608.2 | 617.4 | 650.1
Net investment income | 31.4 | 61.1 | 42.6
Benefits, claims and settlement expenses | 534.3 | 447.9 | 431.0
Amortization of deferred policy acquisition costs | 64.3 | 67.7 | 74.4
Other operating expenses | 102.6 | 97.2 | 97.7
Net premiums written (excluding life) | 617.5 | 607.8 | 635.5
Life & Retirement |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 403.5 | 219.4 | 199.4
Future policy benefits, claims and claim expenses | 6,323.9 | 6,247.4 | 6,119.6
Unearned premiums | 2.1 | 2.2 | 2.0
Other policy claims and benefits payable | 860.6 | 873.4 | 709.8
Premium revenue/ premium earned | 145.3 | 144.2 | 147.0
Net investment income | 338.3 | 338.6 | 299.3
Benefits, claims and settlement expenses | 303.8 | 292.9 | 298.2
Amortization of deferred policy acquisition costs | 32.8 | 25.5 | 23.8
Other operating expenses | 108.6 | 102.4 | 105.4
Supplemental & Group Benefits |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred policy acquisition costs | 5.1 | 4.2 | 4.3
Future policy benefits, claims and claim expenses | 840.5 | 393.9 | 392.4
Unearned premiums | 3.0 | 3.1 | 3.1
Other policy claims and benefits payable | 93.4 | 72.5 | 41.5
Premium revenue/ premium earned | 275.5 | 128.0 | 133.6
Net investment income | 33.3 | 25.2 | 18.1
Benefits, claims and settlement expenses | 101.1 | 41.3 | 44.3
Amortization of deferred policy acquisition costs | 1.6 | 1.5 | 1.7
Other operating expenses | 118.1 | 54.4 | 53.6
Other, including consolidating eliminations | Eliminations |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Net investment income | (2.1) | (2.4) | (2.4)
Other operating expenses | $ 27.6 | $ 24.4 | $ 20.7

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