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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, 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 | $ 473.5 | $ 469.0
Expected future benefits and expenses, undiscounted | 1,134.3 | 1,121.4
Expected future gross premiums, discounted | 325.1 | 322.5
Expected future benefits and expenses, discounted | 588.7 | 580.4
Term Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 751.4 | 739.3
Expected future benefits and expenses, undiscounted | 693.9 | 678.0
Expected future gross premiums, discounted | 469.0 | 464.2
Expected future benefits and expenses, discounted | 406.4 | 401.0
Experience Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 551.9 | 569.6
Expected future benefits and expenses, undiscounted | 1,728.7 | 1,755.4
Expected future gross premiums, discounted | 306.7 | 315.5
Expected future benefits and expenses, discounted | 799.6 | 805.2
Limited Pay Whole Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 63.1 | 60.8
Expected future benefits and expenses, undiscounted | 234.6 | 226.8
Expected future gross premiums, discounted | 48.1 | 46.5
Expected future benefits and expenses, discounted | 102.6 | 98.6
Supplemental health |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 1,645.7 | 1,640.5
Expected future benefits and expenses, undiscounted | 720.7 | 730.4
Expected future gross premiums, discounted | 1,213.6 | 1,214.9
Expected future benefits and expenses, discounted | 525.8 | 537.0
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 | 158.1 | 157.7
Expected future gross premiums, discounted | 0.0 | 0.0
Expected future benefits and expenses, discounted | $ 113.0 | $ 113.4

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