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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, 2024 | Dec. 31, 2023
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Whole Life Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | $ 473.5 | $ 478.8
Expected future benefits and expenses, undiscounted | 1,151.5 | 1,152.8
Expected future gross premiums, discounted | 323.0 | 325.0
Expected future benefits and expenses, discounted | 592.0 | 592.1
Term Life Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 695.7 | 689.0
Expected future benefits and expenses, undiscounted | 694.7 | 682.7
Expected future gross premiums, discounted | 452.3 | 449.4
Expected future benefits and expenses, discounted | 411.1 | 405.4
Experience Life Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 519.4 | 530.0
Expected future benefits and expenses, undiscounted | 1,684.3 | 1,703.1
Expected future gross premiums, discounted | 290.6 | 296.1
Expected future benefits and expenses, discounted | 791.7 | 797.5
Limited Pay Whole Life Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 65.6 | 64.7
Expected future benefits and expenses, undiscounted | 249.2 | 244.9
Expected future gross premiums, discounted | 49.6 | 49.1
Expected future benefits and expenses, discounted | 107.3 | 105.6
Supplemental health |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 1,619.2 | 1,624.1
Expected future benefits and expenses, undiscounted | 712.7 | 719.4
Expected future gross premiums, discounted | 1,187.4 | 1,192.5
Expected future benefits and expenses, discounted | 510.5 | 517.9
Life Contingent SPIA Retirement Insurance |  |
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 | 155.0 | 156.1
Expected future gross premiums, discounted | 0.0 | 0.0
Expected future benefits and expenses, discounted | $ 110.3 | $ 111.4

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