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Long-Duration Insurance Contracts - Undiscounted and Discounted Expected Gross Premiums and Expected Future Benefits and Expenses (Details) - USD ($) $ in Millions | Jun. 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 | $ 526.4 | $ 524.0
Expected future benefits and expenses, undiscounted | 1,283.2 | 1,272.9
Expected future gross premiums, discounted | 353.1 | 350.5
Expected future benefits and expenses, discounted | 622.1 | 617.4
Term Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 720.8 | 712.1
Expected future benefits and expenses, undiscounted | 755.5 | 736.2
Expected future gross premiums, discounted | 467.7 | 464.2
Expected future benefits and expenses, discounted | 442.5 | 433.2
Experience life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 477.5 | 497.8
Expected future benefits and expenses, undiscounted | 1,602.8 | 1,639.0
Expected future gross premiums, discounted | 268.6 | 279.3
Expected future benefits and expenses, discounted | 771.8 | 782.8
Limited-Pay Whole Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 72.7 | 73.6
Expected future benefits and expenses, undiscounted | 312.0 | 307.2
Expected future gross premiums, discounted | 54.1 | 54.7
Expected future benefits and expenses, discounted | 116.4 | 114.3
Supplemental health |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 1,606.3 | 1,595.3
Expected future benefits and expenses, undiscounted | 686.2 | 684.6
Expected future gross premiums, discounted | 1,165.3 | 1,165.4
Expected future benefits and expenses, discounted | 476.8 | 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 | 147.7 | 150.7
Expected future gross premiums, discounted | 0.0 | 0.0
Expected future benefits and expenses, discounted | $ 105.2 | $ 107.3

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