Debt - Components of Convertible Notes (Details)	1 Months Ended		12 Months Ended
	Dec. 31, 2019 USD ($) trading_day $ / shares	Mar. 31, 2017 USD ($) trading_day $ / shares	Jul. 03, 2021 USD ($) trading_day $ / shares	Jun. 27, 2020 USD ($)
2026 Notes
Liability component:
Conversion price (in dollars per share) | $ / shares	$ 129.08
Convertible Debt | 2024 Notes
Liability component:
Principal		$ 450,000,000	$ 450,000,000.0	$ 450,000,000.0
Unamortized debt discount and debt issuance costs			(59,300,000)	(79,400,000)
Net carrying amount of the liability component			$ 390,700,000	370,600,000
Sale price of common stock (in dollars per share) | $ / shares		$ 78.80	$ 78.80
Conversion threshold percentage of stock price trigger		130.00%	130.00%
Conversion price (in dollars per share) | $ / shares		$ 60.62	$ 60.62
Number of days to trigger conversion			20 days
Conversion threshold consecutive trading days | trading_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)		(260,200,000)	(300,300,000)
Net carrying amount of the liability component			$ 789,800,000	$ 749,700,000
Sale price of common stock (in dollars per share) | $ / shares			$ 129.08
Conversion threshold percentage of stock price trigger	130.00%		130.00%
Conversion price (in dollars per share) | $ / shares	$ 99.29		$ 99.29
Number of days to trigger conversion			20 days
Conversion threshold consecutive trading days | trading_day	30		30