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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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