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Marketable Securities and Fair Value Measurements (Details) - Level 2 - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	$ 541.3	$ 937.9
Gross Unrealized Gains	1.2	1.7
Gross Unrealized Losses	0.0	(0.7)
Fair Value	542.5	938.9
Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	528.0	934.4
Gross Unrealized Gains	1.1	1.7
Gross Unrealized Losses	0.0	(0.7)
Fair Value	529.1	935.4
Government securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	13.3	3.5
Gross Unrealized Gains	0.1	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	$ 13.4	$ 3.5

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