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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest earned on marketable securities	$ 16.3	$ 20.1	$ 53.2	$ 70.7
Investment in equity securities, carrying value	20.3		20.3		$ 23.5
2029 Senior Notes | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of the notes	477.3		477.3		464.9
2031 Senior Notes | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of the notes	$ 471.1		$ 471.1		$ 453.9

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Amount of investment in equity security without readily determinable fair value.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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