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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, 2023 | Mar. 31, 2022
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Whole Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | $ 471.6 | $ 448.0
Expected future benefits and expenses, undiscounted | 1,128.1 | 1,080.6
Expected future gross premiums, discounted | 322.5 | 308.9
Expected future benefits and expenses, discounted | 585.4 | 568.1
Term Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 744.6 | 720.9
Expected future benefits and expenses, undiscounted | 687.8 | 597.0
Expected future gross premiums, discounted | 465.3 | 447.0
Expected future benefits and expenses, discounted | 405.2 | 355.8
Experience Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 559.0 | 598.4
Expected future benefits and expenses, undiscounted | 1,740.3 | 1,774.5
Expected future gross premiums, discounted | 310.2 | 329.4
Expected future benefits and expenses, discounted | 801.5 | 799.5
Limited Pay Whole Life |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 61.9 | 51.3
Expected future benefits and expenses, undiscounted | 230.7 | 196.9
Expected future gross premiums, discounted | 47.3 | 39.7
Expected future benefits and expenses, discounted | 100.3 | 88.8
Supplemental health |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Expected future gross premiums, undiscounted | 1,644.2 | 1,633.3
Expected future benefits and expenses, undiscounted | 724.6 | 776.3
Expected future gross premiums, discounted | 1,215.1 | 127.3
Expected future benefits and expenses, discounted | 530.6 | 577.4
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 | 158.2 | 161.6
Expected future gross premiums, discounted | 0.0 | 0.0
Expected future benefits and expenses, discounted | $ 113.3 | $ 116.2

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