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v3.25.1

Investments - Debt Securities (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt securities, available for sale |  |
Cost or amortized cost | $ 4,617.0 | $ 5,143.8
Gross unrealized gains | 47.2 | 32.3
Gross unrealized losses | (21.5) | (40.2)
Net foreign currency losses | (7.5) | (4.9)
Fair value | 4,635.2 | 5,131.0
Debt securities, trading |  |
Cost or amortized cost | 140.9 | 187.3
Gross unrealized gains | 0.4 | 0.6
Gross unrealized losses | (23.7) | (25.7)
Net foreign currency losses | 0.0 | 0.0
Fair value | 117.6 | 162.2
Debt securities, available for sale, allowance for credit losses | 0.0 | 1.1
Asset-backed securities |  |
Debt securities, available for sale |  |
Cost or amortized cost | 1,001.5 | 1,142.7
Gross unrealized gains | 9.6 | 11.2
Gross unrealized losses | (3.3) | (4.2)
Net foreign currency losses | 0.0 | 0.0
Fair value | 1,007.8 | 1,149.7
Debt securities, trading |  |
Cost or amortized cost | 20.0 | 54.7
Gross unrealized gains | 0.0 | 0.0
Gross unrealized losses | (0.9) | (1.6)
Net foreign currency losses | 0.0 | 0.0
Fair value | 19.1 | 53.1
Residential mortgage-backed securities |  |
Debt securities, available for sale |  |
Cost or amortized cost | 930.1 | 985.8
Gross unrealized gains | 11.8 | 8.3
Gross unrealized losses | (10.9) | (20.3)
Net foreign currency losses | 0.0 | 0.0
Fair value | 931.0 | 973.8
Debt securities, trading |  |
Cost or amortized cost | 54.8 | 56.4
Gross unrealized gains | 0.1 | 0.0
Gross unrealized losses | (7.0) | (7.7)
Net foreign currency losses | 0.0 | 0.0
Fair value | 47.9 | 48.7
Commercial mortgage-backed securities |  |
Debt securities, available for sale |  |
Cost or amortized cost | 172.2 | 224.2
Gross unrealized gains | 2.3 | 1.4
Gross unrealized losses | (0.5) | (1.1)
Net foreign currency losses | 0.0 | 0.0
Fair value | 174.0 | 224.5
Debt securities, trading |  |
Cost or amortized cost | 46.3 | 56.8
Gross unrealized gains | 0.3 | 0.5
Gross unrealized losses | (3.9) | (5.5)
Net foreign currency losses | 0.0 | 0.0
Fair value | 42.7 | 51.8
Corporate debt securities |  |
Debt securities, available for sale |  |
Cost or amortized cost | 1,615.3 | 1,905.2
Gross unrealized gains | 15.9 | 9.1
Gross unrealized losses | (5.4) | (10.4)
Net foreign currency losses | (7.5) | (4.0)
Fair value | 1,618.3 | 1,899.9
Debt securities, trading |  |
Cost or amortized cost | 15.5 | 15.1
Gross unrealized gains | 0.0 | 0.1
Gross unrealized losses | (11.7) | (10.6)
Net foreign currency losses | 0.0 | 0.0
Fair value | 3.8 | 4.6
U.S. government and government agency |  |
Debt securities, available for sale |  |
Cost or amortized cost | 875.4 | 861.0
Gross unrealized gains | 7.4 | 2.2
Gross unrealized losses | (1.4) | (4.2)
Net foreign currency losses | 0.0 | 0.0
Fair value | 881.4 | 859.0
Debt securities, trading |  |
Cost or amortized cost | 4.3 | 4.3
Gross unrealized gains | 0.0 | 0.0
Gross unrealized losses | (0.2) | (0.3)
Net foreign currency losses | 0.0 | 0.0
Fair value | 4.1 | 4.0
Non-U.S. government and government agency |  |
Debt securities, available for sale |  |
Cost or amortized cost | 22.5 | 24.9
Gross unrealized gains | 0.2 | 0.1
Gross unrealized losses | 0.0 | 0.0
Net foreign currency losses | 0.0 | (0.9)
Fair value | $ 22.7 | $ 24.1

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