Debt - Components of Convertible Notes (Details)		1 Months Ended			3 Months Ended
	Jun. 16, 2023 USD ($) day $ / shares	Mar. 31, 2022 USD ($) day $ / shares	Dec. 31, 2019 USD ($) day $ / shares	Mar. 31, 2017 USD ($) day $ / shares	Sep. 30, 2023 USD ($) day $ / shares	Jul. 01, 2023 USD ($)
2026 Notes
Liability component:
Sale price of common stock (in usd per share) | $ / shares			$ 129.08
Convertible Debt
Liability component:
Principal					$ 2,837,800,000	$ 2,837,800,000
Unamortized debt discount and debt issuance costs					(21,200,000)	(26,200,000)
Net carrying amount of the liability component					2,816,600,000	2,811,600,000
Convertible Debt | 2024 Notes
Liability component:
Principal	$ 125,000,000			$ 450,000,000	323,100,000	323,100,000
Unamortized debt discount and debt issuance costs					(7,400,000)	(11,500,000)
Net carrying amount of the liability component					$ 315,700,000	311,600,000
Sale price of common stock (in usd per share) | $ / shares				$ 78.80	$ 78.80
Conversion threshold percentage of stock price trigger (as a percent)				130.00%	130.00%
Conversion price (in usd per share) | $ / shares				$ 60.62	$ 60.62
Number of days to trigger conversion | day					20
Conversion threshold consecutive trading days (in days) | day				30	30
Convertible Debt | 2026 Notes
Liability component:
Principal			$ 1,050,000,000		$ 1,050,000,000	1,050,000,000
Unamortized debt discount and debt issuance costs			$ (315,200,000)		(3,800,000)	(4,100,000)
Net carrying amount of the liability component					$ 1,046,200,000	1,045,900,000
Sale price of common stock (in usd per share) | $ / shares					$ 129.08
Conversion threshold percentage of stock price trigger (as a percent)			130.00%		130.00%
Conversion price (in usd per share) | $ / shares			$ 99.29		$ 99.29
Number of days to trigger conversion | day					20
Conversion threshold consecutive trading days (in days) | day			30		30
Convertible Debt | 2028 Notes
Liability component:
Principal		$ 861,000,000			$ 861,000,000.0	861,000,000.0
Unamortized debt discount and debt issuance costs		$ (231,200,000)			(5,100,000)	(5,500,000)
Net carrying amount of the liability component					$ 855,900,000	855,500,000
Sale price of common stock (in usd per share) | $ / shares		$ 170.34			$ 170.34
Conversion threshold percentage of stock price trigger (as a percent)		130.00%			130.00%
Conversion price (in usd per share) | $ / shares		$ 131.03			$ 131.03
Number of days to trigger conversion | day		20			20
Conversion threshold consecutive trading days (in days) | day		30			30
Convertible Debt | 2029 Notes
Liability component:
Principal	$ 603,700,000				$ 603,700,000	603,700,000
Unamortized debt discount and debt issuance costs					(4,900,000)	(5,100,000)
Net carrying amount of the liability component					$ 598,800,000	$ 598,600,000
Sale price of common stock (in usd per share) | $ / shares					$ 90.40
Conversion threshold percentage of stock price trigger (as a percent)	130.00%				130.00%
Conversion price (in usd per share) | $ / shares	$ 69.54				$ 69.54
Number of days to trigger conversion | day	20				20
Conversion threshold consecutive trading days (in days) | day	30				30