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Long-Duration Insurance Contracts - Undiscounted and Discounted Expected Gross Premiums and Expected Future Benefits and Expenses (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Whole Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | $ 525.6 | $ 524.0
Expected future benefits and expenses, undiscounted | 1,279.8 | 1,272.9
Expected future gross premiums, discounted | 350.7 | 350.5
Expected future benefits and expenses, discounted | 618.2 | 617.4
Term Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 715.4 | 712.1
Expected future benefits and expenses, undiscounted | 745.1 | 736.2
Expected future gross premiums, discounted | 464.8 | 464.2
Expected future benefits and expenses, discounted | 437.3 | 433.2
Experience life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 487.5 | 497.8
Expected future benefits and expenses, undiscounted | 1,619.8 | 1,639.0
Expected future gross premiums, discounted | 273.8 | 279.3
Expected future benefits and expenses, discounted | 776.3 | 782.8
Limited-Pay Whole Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 72.6 | 73.6
Expected future benefits and expenses, undiscounted | 309.0 | 307.2
Expected future gross premiums, discounted | 53.9 | 54.7
Expected future benefits and expenses, discounted | 115.1 | 114.3
Supplemental health |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 1,589.6 | 1,595.3
Expected future benefits and expenses, undiscounted | 683.7 | 684.6
Expected future gross premiums, discounted | 1,158.6 | 1,165.4
Expected future benefits and expenses, discounted | 480.1 | 482.8
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 | 148.8 | 150.7
Expected future gross premiums, discounted | 0.0 | 0.0
Expected future benefits and expenses, discounted | $ 106.0 | $ 107.3

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