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Long-Duration Insurance Contracts - Undiscounted and Discounted Expected Gross Premiums and Expected Future Benefits and Expenses (Details) - USD ($) $ in Millions | Dec. 31, 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 | $ 478.8 | $ 469.0
Expected future benefits and expenses, undiscounted | 1,152.8 | 1,121.4
Expected future gross premiums, discounted | 325.0 | 322.5
Expected future benefits and expenses, discounted | 592.1 | 580.4
Term Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 689.0 | 739.3
Expected future benefits and expenses, undiscounted | 682.7 | 678.0
Expected future gross premiums, discounted | 449.4 | 464.2
Expected future benefits and expenses, discounted | 405.4 | 401.0
Experience life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 530.0 | 569.6
Expected future benefits and expenses, undiscounted | 1,703.1 | 1,755.4
Expected future gross premiums, discounted | 296.1 | 315.5
Expected future benefits and expenses, discounted | 797.5 | 805.2
Limited-pay whole life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 64.7 | 60.8
Expected future benefits and expenses, undiscounted | 244.9 | 226.8
Expected future gross premiums, discounted | 49.1 | 46.5
Expected future benefits and expenses, discounted | 105.6 | 98.6
Supplemental health |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 1,624.1 | 1,640.5
Expected future benefits and expenses, undiscounted | 719.4 | 730.7
Expected future gross premiums, discounted | 1,192.5 | 1,214.9
Expected future benefits and expenses, discounted | 517.9 | 537.1
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 | 156.1 | 157.7
Expected future gross premiums, discounted | 0.0 | 0.0
Expected future benefits and expenses, discounted | $ 111.4 | $ 113.4

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