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v3.25.1

Fair value measurements - Investments Categorized by the Level of the Fair Value Hierarchy (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Assets |  |
Debt securities, available-for-sale | $ 4,635.2 | $ 5,131.0
Debt securities, trading | 117.6 | 162.2
Short-term investments | 48.2 | 95.8
Other long-term investments | 317.7 | 316.5
Cost and equity method investments | 65.1 | 64.7
Total assets | 5,146.5 | 5,706.4
Liabilities |  |
Derivative liabilities | 6.1 | 14.3
Total liabilities | 6.1 | 14.3
Asset-backed securities |  |
Assets |  |
Debt securities, available-for-sale | 1,007.8 | 1,149.7
Debt securities, trading | 19.1 | 53.1
Residential mortgage-backed securities |  |
Assets |  |
Debt securities, available-for-sale | 931.0 | 973.8
Debt securities, trading | 47.9 | 48.7
Commercial mortgage-backed securities |  |
Assets |  |
Debt securities, available-for-sale | 174.0 | 224.5
Debt securities, trading | 42.7 | 51.8
Corporate debt securities |  |
Assets |  |
Debt securities, available-for-sale | 1,618.3 | 1,899.9
Debt securities, trading | 3.8 | 4.6
U.S. government and government agency |  |
Assets |  |
Debt securities, available-for-sale | 881.4 | 859.0
Debt securities, trading | 4.1 | 4.0
Non-U.S. government and government agency |  |
Assets |  |
Debt securities, available-for-sale | 22.7 | 24.1
Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets |  |
Debt securities, available-for-sale | 4,635.2 | 5,131.0
Debt securities, trading | 117.6 | 162.2
Short-term investments | 48.2 | 95.8
Other long-term investments | 92.4 | 89.9
Derivative assets | 27.8 | 0.9
Total assets | 4,921.2 | 5,479.8
Fair Value, Inputs, Level 1, 2 and 3 | Asset-backed securities |  |
Assets |  |
Debt securities, available-for-sale | 1,007.8 | 1,149.7
Debt securities, trading | 19.1 | 53.1
Fair Value, Inputs, Level 1, 2 and 3 | Residential mortgage-backed securities |  |
Assets |  |
Debt securities, available-for-sale | 931.0 | 973.8
Debt securities, trading | 47.9 | 48.7
Fair Value, Inputs, Level 1, 2 and 3 | Commercial mortgage-backed securities |  |
Assets |  |
Debt securities, available-for-sale | 174.0 | 224.5
Debt securities, trading | 42.7 | 51.8
Fair Value, Inputs, Level 1, 2 and 3 | Corporate debt securities |  |
Assets |  |
Debt securities, available-for-sale | 1,618.3 | 1,899.9
Debt securities, trading | 3.8 | 4.6
Fair Value, Inputs, Level 1, 2 and 3 | U.S. government and government agency |  |
Assets |  |
Debt securities, available-for-sale | 881.4 | 859.0
Debt securities, trading | 4.1 | 4.0
Fair Value, Inputs, Level 1, 2 and 3 | Non-U.S. government and government agency |  |
Assets |  |
Debt securities, available-for-sale | 22.7 | 24.1
Quoted prices in active markets (Level 1) |  |
Assets |  |
Debt securities, available-for-sale | 881.4 | 859.0
Debt securities, trading | 4.1 | 4.0
Short-term investments | 48.2 | 73.6
Other long-term investments | 0.3 | 0.3
Derivative assets | 0.0 | 0.0
Total assets | 934.0 | 936.9
Liabilities |  |
Derivative liabilities | 0.0 | 0.0
Total liabilities | 0.0 | 0.0
Quoted prices in active markets (Level 1) | Asset-backed securities |  |
Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Debt securities, trading | 0.0 | 0.0
Quoted prices in active markets (Level 1) | Residential mortgage-backed securities |  |
Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Debt securities, trading | 0.0 | 0.0
Quoted prices in active markets (Level 1) | Commercial mortgage-backed securities |  |
Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Debt securities, trading | 0.0 | 0.0
Quoted prices in active markets (Level 1) | Corporate debt securities |  |
Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Debt securities, trading | 0.0 | 0.0
Quoted prices in active markets (Level 1) | U.S. government and government agency |  |
Assets |  |
Debt securities, available-for-sale | 881.4 | 859.0
Debt securities, trading | 4.1 | 4.0
Quoted prices in active markets (Level 1) | Non-U.S. government and government agency |  |
Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Significant other observable inputs (Level 2) |  |
Assets |  |
Debt securities, available-for-sale | 3,753.8 | 4,272.0
Debt securities, trading | 113.5 | 158.2
Short-term investments | 0.0 | 22.2
Other long-term investments | 5.1 | 3.0
Derivative assets | 0.0 | 0.0
Total assets | 3,872.4 | 4,455.4
Liabilities |  |
Derivative liabilities | 0.0 | 0.0
Total liabilities | 0.0 | 0.0
Significant other observable inputs (Level 2) | Asset-backed securities |  |
Assets |  |
Debt securities, available-for-sale | 1,007.8 | 1,149.7
Debt securities, trading | 19.1 | 53.1
Significant other observable inputs (Level 2) | Residential mortgage-backed securities |  |
Assets |  |
Debt securities, available-for-sale | 931.0 | 973.8
Debt securities, trading | 47.9 | 48.7
Significant other observable inputs (Level 2) | Commercial mortgage-backed securities |  |
Assets |  |
Debt securities, available-for-sale | 174.0 | 224.5
Debt securities, trading | 42.7 | 51.8
Significant other observable inputs (Level 2) | Corporate debt securities |  |
Assets |  |
Debt securities, available-for-sale | 1,618.3 | 1,899.9
Debt securities, trading | 3.8 | 4.6
Significant other observable inputs (Level 2) | U.S. government and government agency |  |
Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Debt securities, trading | 0.0 | 0.0
Significant other observable inputs (Level 2) | Non-U.S. government and government agency |  |
Assets |  |
Debt securities, available-for-sale | 22.7 | 24.1
Significant unobservable inputs (Level 3) |  |
Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Debt securities, trading | 0.0 | 0.0
Short-term investments | 0.0 | 0.0
Other long-term investments | 87.0 | 86.6
Derivative assets | 27.8 | 0.9
Total assets | 114.8 | 87.5
Liabilities |  |
Derivative liabilities | 6.1 | 14.3
Total liabilities | 6.1 | 14.3
Significant unobservable inputs (Level 3) | Asset-backed securities |  |
Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Debt securities, trading | 0.0 | 0.0
Significant unobservable inputs (Level 3) | Residential mortgage-backed securities |  |
Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Debt securities, trading | 0.0 | 0.0
Significant unobservable inputs (Level 3) | Commercial mortgage-backed securities |  |
Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Debt securities, trading | 0.0 | 0.0
Significant unobservable inputs (Level 3) | Corporate debt securities |  |
Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Debt securities, trading | 0.0 | 0.0
Significant unobservable inputs (Level 3) | U.S. government and government agency |  |
Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Debt securities, trading | 0.0 | 0.0
Significant unobservable inputs (Level 3) | Non-U.S. government and government agency |  |
Assets |  |
Debt securities, available-for-sale | 0.0 | 0.0
Valued at NAV |  |
Assets |  |
Investments in funds valued at NAV | $ 160.2 | $ 161.9

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