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Long-Duration Insurance Contracts - Account Balances by Guaranteed Minimum Interest Rates (Details) $ in Millions | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 5,137.6 | $ 5,187.0
Less than 2% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 859.7 | 886.1
Equal to 2% but less than 3% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 418.3 | 382.7
Equal to 3% but less than 4% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 589.3 | 609.0
Equal to 4% but less than 5% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 2,644.1 | 2,670.5
5% or higher |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 85.6 | 86.9
Policyholder account balance with a guaranteed minimum crediting rate |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 4,597.0 | $ 4,635.2
Minimum | Equal to 2% but less than 3% |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, guaranteed minimum credit rating | 2.00% | 2.00%
Minimum | Equal to 3% but less than 4% |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, guaranteed minimum credit rating | 3.00% | 3.00%
Minimum | Equal to 4% but less than 5% |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, guaranteed minimum credit rating | 4.00% | 4.00%
Minimum | 5% or higher |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, guaranteed minimum credit rating | 5.00% | 5.00%
Maximum | Less than 2% |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, guaranteed minimum credit rating | 2.00% | 2.00%
Maximum | Equal to 2% but less than 3% |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, guaranteed minimum credit rating | 3.00% | 3.00%
Maximum | Equal to 3% but less than 4% |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, guaranteed minimum credit rating | 4.00% | 4.00%
Maximum | Equal to 4% but less than 5% |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, guaranteed minimum credit rating | 5.00% | 5.00%
At Guaranteed Minimum | Less than 2% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 22.4 | $ 36.7
At Guaranteed Minimum | Equal to 2% but less than 3% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 132.2 | 162.9
At Guaranteed Minimum | Equal to 3% but less than 4% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 546.4 | 571.3
At Guaranteed Minimum | Equal to 4% but less than 5% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 2,644.1 | 2,670.5
At Guaranteed Minimum | 5% or higher |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 85.6 | 86.9
At Guaranteed Minimum | Policyholder account balance with a guaranteed minimum crediting rate |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 3,430.7 | 3,528.3
1-50 Basis Points Above | Less than 2% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 114.3 | 159.8
1-50 Basis Points Above | Equal to 2% but less than 3% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 101.2 | 77.9
1-50 Basis Points Above | Equal to 3% but less than 4% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 42.2 | 36.9
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 | $ 257.7 | $ 274.6
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
51-150 Basis Points Above | Less than 2% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 506.5 | $ 489.4
51-150 Basis Points Above | Equal to 2% but less than 3% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 77.1 | 65.8
51-150 Basis Points Above | Equal to 3% but less than 4% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 0.7 | 0.7
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 | $ 584.3 | $ 555.9
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
Greater Than 150 Basis Points Above | Less than 2% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 216.5 | $ 200.2
Greater Than 150 Basis Points Above | Equal to 2% but less than 3% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 107.8 | 76.1
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 | $ 324.3 | $ 276.3
Greater Than 150 Basis Points Above | Minimum |  |
Policyholder Account Balance [Line Items] |  |
Policyholder account balance, above guaranteed minimum crediting rate | 0.0150 | 0.0150

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