Investments - Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 3,036.1	$ 3,041.7
Gross Unrealized Gains	14.2	5.0
Gross Unrealized Losses	(0.3)	(4.0)
Fair Value	3,050.0	3,042.7
U.S. government and agency securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	2,433.0	2,473.7
Gross Unrealized Gains	10.5	3.1
Gross Unrealized Losses	(0.3)	(3.5)
Fair Value	2,443.2	2,473.3
Corporate debt securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	603.1	568.0
Gross Unrealized Gains	3.7	1.9
Gross Unrealized Losses	0.0	(0.5)
Fair Value	$ 606.8	$ 569.4

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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