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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, 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 | $ 552.0 | $ 524.0
Expected future benefits and expenses, undiscounted | 1,347.4 | 1,272.9
Expected future gross premiums, discounted | 362.8 | 350.5
Expected future benefits and expenses, discounted | 629.4 | 617.4
Term Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 689.2 | 712.1
Expected future benefits and expenses, undiscounted | 728.1 | 736.2
Expected future gross premiums, discounted | 455.5 | 464.2
Expected future benefits and expenses, discounted | 425.8 | 433.2
Experience life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 461.9 | 497.8
Expected future benefits and expenses, undiscounted | 1,549.5 | 1,639.0
Expected future gross premiums, discounted | 261.1 | 279.3
Expected future benefits and expenses, discounted | 768.9 | 782.8
Limited-Pay Whole Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 75.6 | 73.6
Expected future benefits and expenses, undiscounted | 335.2 | 307.2
Expected future gross premiums, discounted | 55.9 | 54.7
Expected future benefits and expenses, discounted | 117.5 | 114.3
Supplemental health |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 1,607.5 | 1,595.3
Expected future benefits and expenses, undiscounted | 675.5 | 684.6
Expected future gross premiums, discounted | 1,162.1 | 1,165.4
Expected future benefits and expenses, discounted | 466.2 | 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 | 146.4 | 150.7
Expected future gross premiums, discounted | 0.0 | 0.0
Expected future benefits and expenses, discounted | $ 104.2 | $ 107.3

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