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Long-Duration Insurance Contracts - Undiscounted and Discounted Expected Gross Premiums and Expected Future Benefits and Expenses (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Whole Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | $ 473.9 | $ 469.0
Expected future benefits and expenses, undiscounted | 1,138.5 | 1,121.4
Expected future gross premiums, discounted | 323.6 | 322.5
Expected future benefits and expenses, discounted | 591.2 | 580.4
Term Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 757.0 | 739.3
Expected future benefits and expenses, undiscounted | 704.2 | 678.0
Expected future gross premiums, discounted | 471.7 | 464.2
Expected future benefits and expenses, discounted | 411.4 | 401.0
Experience Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 542.1 | 569.6
Expected future benefits and expenses, undiscounted | 1,713.6 | 1,755.4
Expected future gross premiums, discounted | 301.8 | 315.5
Expected future benefits and expenses, discounted | 796.4 | 805.2
Limited Pay Whole Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 63.3 | 60.8
Expected future benefits and expenses, undiscounted | 238.3 | 226.8
Expected future gross premiums, discounted | 48.2 | 46.5
Expected future benefits and expenses, discounted | 104.3 | 98.6
Supplemental health |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 1,639.2 | 1,615.5
Expected future benefits and expenses, undiscounted | 713.5 | 761.4
Expected future gross premiums, discounted | 1,206.3 | 1,208.1
Expected future benefits and expenses, discounted | 517.2 | 563.6
SPIA (life contingent) |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 0.0 | 0.0
Expected future benefits and expenses, undiscounted | 156.7 | 157.7
Expected future gross premiums, discounted | 0.0 | 0.0
Expected future benefits and expenses, discounted | $ 111.9 | $ 113.4

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