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Segment Information - Additional Significant Financial Information by Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information |  |  |
DAC unlocking and amortization expense | $ 94.7 | $ 99.9 | $ 109.2
Income tax expense (benefit) | 32.1 | 26.3 | 52.0
Property & Casualty | Operating Segments |  |  |
Segment Reporting Information |  |  |
DAC unlocking and amortization expense | 67.7 | 74.4 | 79.5
Income tax expense (benefit) | 13.2 | 15.4 | 14.0
Supplemental | Operating Segments |  |  |
Segment Reporting Information |  |  |
DAC unlocking and amortization expense | 1.2 | 1.3 | 0.4
Income tax expense (benefit) | 12.7 | 12.0 | 5.1
Retirement | Operating Segments |  |  |
Segment Reporting Information |  |  |
DAC unlocking and amortization expense | 18.5 | 16.7 | 21.5
Income tax expense (benefit) | 9.9 | 2.1 | 33.8
Life | Operating Segments |  |  |
Segment Reporting Information |  |  |
DAC unlocking and amortization expense | 7.3 | 7.5 | 7.8
Income tax expense (benefit) | 3.6 | 2.4 | 4.9
Corporate & Other | Corporate and Other |  |  |
Segment Reporting Information |  |  |
Income tax expense (benefit) | $ (7.3) | $ (5.6) | $ (5.8)

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