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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity Securities, Fair Value	$ 116.9	$ 116.9	$ 193.2
Gain (loss) on investments	76.2	(79.8)
Unrealized gains (loss) on investments	53.5	(69.7)
Marketable securities contractual maturities	0.2	0.2
Marketable securities	2,400.0	2,400.0
Level 2 Securities | 2028 Notes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Convertible notes	1,000.0	1,000.0
Level 2 Securities | 2027 Notes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Convertible notes	798.0	798.0	1,100.0
Level 2 Securities | 2025 Notes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Convertible notes	262.6	262.6	650.1
Level 2 Securities | 2026 Notes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Convertible notes	$ 725.6	$ 725.6	$ 1,900.0
Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities contractual maturities period		1 year
Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities contractual maturities period		5 years

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