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v3.25.3

Long-Duration Insurance Contracts - Account Balances by Guaranteed Minimum Interest Rates (Details) $ in Millions | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
--- | --- | ---
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 5,092.0 | $ 5,100.3
Less than 2% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 755.8 | $ 797.6
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 | $ 503.4 | $ 449.4
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 | $ 683.0 | $ 653.4
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 | $ 2,565.2 | $ 2,600.0
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 | $ 79.8 | $ 81.8
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 | $ 4,587.2 | $ 4,582.2
At Guaranteed Minimum | Less than 2% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 9.0 | 15.9
At Guaranteed Minimum | Equal to 2% but less than 3% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 70.4 | 94.5
At Guaranteed Minimum | Equal to 3% but less than 4% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 571.8 | 545.6
At Guaranteed Minimum | Equal to 4% but less than 5% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 2,565.2 | 2,600.0
At Guaranteed Minimum | 5% or higher |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 79.8 | 81.8
At Guaranteed Minimum | Policyholder account balance with a guaranteed minimum crediting rate |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | $ 3,296.2 | $ 3,337.8
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 | $ 10.8 | $ 77.3
1-50 Basis Points Above | Equal to 2% but less than 3% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 145.6 | 122.2
1-50 Basis Points Above | Equal to 3% but less than 4% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 10.0 | 43.3
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 | $ 166.4 | $ 242.8
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 | $ 310.4 | $ 400.4
51-150 Basis Points Above | Equal to 2% but less than 3% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 121.0 | 97.9
51-150 Basis Points Above | Equal to 3% but less than 4% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 22.4 | 13.3
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 | $ 453.8 | $ 511.6
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 | $ 425.7 | $ 304.0
Greater Than 150 Basis Points Above | Equal to 2% but less than 3% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 166.3 | 134.8
Greater Than 150 Basis Points Above | Equal to 3% but less than 4% |  |
Policyholder Account Balance [Line Items] |  |
Policyholders' account balances | 78.8 | 51.2
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 | $ 670.8 | $ 490.0

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