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Fair Value of Financial Instruments - Level 3 Assets and Liabilities Measured at Fair Value with Corresponding Pricing Sources (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 5,666.5 | $ 5,387.9
Equity securities | 44.3 | 66.5
Limited partnership interests | 1,137.8 | 1,121.3
Mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 632.4 | 755.8
Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 1,198.2 | 1,150.8
Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 1,840.7 | 1,782.4
Other asset-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 1,621.8 | 1,328.2
Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Limited partnership interests | 33.5 | 28.9
Fair Value | Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 5,666.5 | 5,387.9
Equity securities | 44.3 | 66.5
Limited partnership interests | 33.5 | 28.9
Financial Liabilities | 75.3 | 79.6
Fair Value | Recurring | Mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 632.3 | 755.8
Fair Value | Recurring | Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 1,198.1 | 1,150.8
Fair Value | Recurring | Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 1,840.8 | 1,782.4
Fair Value | Recurring | Other asset-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 1,621.9 | 1,328.2
Fair Value | Recurring | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 477.4 | 499.9
Equity securities | 4.2 | 4.2
Limited partnership interests | 33.5 | 28.9
Totals | 515.1 | 533.0
Financial Liabilities | 69.8 | 75.5
Fair Value | Recurring | Level 3 | Mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 0.0 | 0.0
Fair Value | Recurring | Level 3 | Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 78.1 | 74.9
Fair Value | Recurring | Level 3 | Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 340.2 | 351.3
Fair Value | Recurring | Level 3 | Other asset-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 59.1 | 73.7
Fair Value | Recurring | Level 3 | Internal |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 193.6 | 199.3
Equity securities | 0.0 | 0.0
Limited partnership interests | 0.0 | 0.0
Totals | 193.6 | 199.3
Fair Value | Recurring | Level 3 | Internal | Mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 0.0 | 0.0
Fair Value | Recurring | Level 3 | Internal | Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 0.0 | 0.0
Fair Value | Recurring | Level 3 | Internal | Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 193.6 | 199.3
Fair Value | Recurring | Level 3 | Internal | Other asset-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 0.0 | 0.0
Fair Value | Recurring | Level 3 | External |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 283.8 | 300.6
Equity securities | 4.2 | 4.2
Limited partnership interests | 33.5 | 28.9
Totals | 321.5 | 333.7
Financial Liabilities | 0.0 | 0.0
Fair Value | Recurring | Level 3 | External | Mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 0.0 | 0.0
Fair Value | Recurring | Level 3 | External | Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 78.1 | 74.9
Fair Value | Recurring | Level 3 | External | Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 146.6 | 152.0
Fair Value | Recurring | Level 3 | External | Other asset-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 59.1 | $ 73.7

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