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Marketable Securities and Fair Value Measurements (Details) - Level 2 - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	$ 745.3	$ 937.9
Gross Unrealized Gains	1.3	1.7
Gross Unrealized Losses	(0.3)	(0.7)
Fair Value	746.3	938.9
Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	685.6	934.4
Gross Unrealized Gains	1.3	1.7
Gross Unrealized Losses	(0.3)	(0.7)
Fair Value	686.6	935.4
Government securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	59.7	3.5
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	$ 59.7	$ 3.5

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