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Long-Duration Insurance Contracts - Account Balances by Guaranteed Minimum Interest Rates (Details) $ in Millions | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | ---
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | $ 5,187.0 | $ 5,260.6 | [1]
Less than 2% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | $ 886.1 | $ 943.6 |
Less than 2% | Maximum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 2.00% | 2.00% |
Equal to 2% but less than 3% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | $ 382.7 | $ 280.6 |
Equal to 2% but less than 3% | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 2.00% | 2.00% |
Equal to 2% but less than 3% | Maximum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 3.00% | 3.00% |
Equal to 3% but less than 4% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | $ 609.0 | $ 668.2 |
Equal to 3% but less than 4% | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 3.00% | 3.00% |
Equal to 3% but less than 4% | Maximum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 4.00% | 4.00% |
Equal to 4% but less than 5% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | $ 2,670.5 | $ 2,706.1 |
Equal to 4% but less than 5% | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 4.00% | 4.00% |
Equal to 4% but less than 5% | Maximum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 5.00% | 5.00% |
5% or higher |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | $ 86.9 | $ 91.7 |
5% or higher | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, guaranteed minimum credit rating | 5.00% | 5.00% |
Policyholder account balance with a guaranteed minimum crediting rate |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | $ 4,635.2 | $ 4,690.2 |
At Guaranteed Minimum | Less than 2% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | 36.7 | 262.5 |
At Guaranteed Minimum | Equal to 2% but less than 3% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | 162.9 | 256.1 |
At Guaranteed Minimum | Equal to 3% but less than 4% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | 571.3 | 667.4 |
At Guaranteed Minimum | Equal to 4% but less than 5% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | 2,670.5 | 2,706.1 |
At Guaranteed Minimum | 5% or higher |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | 86.9 | 91.7 |
At Guaranteed Minimum | Policyholder account balance with a guaranteed minimum crediting rate |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | $ 3,528.3 | $ 3,983.8 |
1-50 Basis Points Above | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, above guaranteed minimum crediting rate | 0.0001 | 0.0001 |
1-50 Basis Points Above | Maximum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, above guaranteed minimum crediting rate | 0.0050 | 0.0050 |
1-50 Basis Points Above | Less than 2% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | $ 159.8 | $ 370.6 |
1-50 Basis Points Above | Equal to 2% but less than 3% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | 77.9 | 19.8 |
1-50 Basis Points Above | Equal to 3% but less than 4% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | 36.9 | 0.4 |
1-50 Basis Points Above | Equal to 4% but less than 5% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | 0.0 | 0.0 |
1-50 Basis Points Above | 5% or higher |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | 0.0 | 0.0 |
1-50 Basis Points Above | Policyholder account balance with a guaranteed minimum crediting rate |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | $ 274.6 | $ 390.8 |
51-150 Basis Points Above | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, above guaranteed minimum crediting rate | 0.0051 | 0.0051 |
51-150 Basis Points Above | Maximum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, above guaranteed minimum crediting rate | 0.0150 | 0.0150 |
51-150 Basis Points Above | Less than 2% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | $ 489.4 | $ 214.4 |
51-150 Basis Points Above | Equal to 2% but less than 3% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | 65.8 | 4.7 |
51-150 Basis Points Above | Equal to 3% but less than 4% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | 0.7 | 0.4 |
51-150 Basis Points Above | Equal to 4% but less than 5% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | 0.0 | 0.0 |
51-150 Basis Points Above | 5% or higher |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | 0.0 | 0.0 |
51-150 Basis Points Above | Policyholder account balance with a guaranteed minimum crediting rate |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | $ 555.9 | $ 219.5 |
Greater Than 150 Basis Points Above | Minimum |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balance, above guaranteed minimum crediting rate | 0.0150 | 0.0150 |
Greater Than 150 Basis Points Above | Less than 2% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | $ 200.2 | $ 96.1 |
Greater Than 150 Basis Points Above | Equal to 2% but less than 3% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | 76.1 | 0.0 |
Greater Than 150 Basis Points Above | Equal to 3% but less than 4% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | 0.0 | 0.0 |
Greater Than 150 Basis Points Above | Equal to 4% but less than 5% |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | 0.0 | 0.0 |
Greater Than 150 Basis Points Above | 5% or higher |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | 0.0 | 0.0 |
Greater Than 150 Basis Points Above | Policyholder account balance with a guaranteed minimum crediting rate |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholders' account balances | $ 276.3 | $ 96.1 |
[1] | Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements

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