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Convertible Senior Notes (Details)	1 Months Ended			9 Months Ended
	Aug. 31, 2020 USD ($) shares	Apr. 30, 2019 USD ($)	Apr. 30, 2018 USD ($) day	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)
Debt Instrument [Line Items]
Net proceeds				$ 984,096,000	$ 780,180,000
Repayments of convertible senior notes				159,677,000	0
Gain (loss) on extinguishment of debt				(3,315,000)	0
Proceeds from exercise of convertible senior notes capped call				$ 57,414,000	$ 0
Senior Notes
Debt Instrument [Line Items]
Share price (in dollars per share) | $ / shares				$ 71.44
Senior Notes | 0% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Face value	$ 1,000,000,000.0			$ 1,000,000,000
Interest rate, stated percentage	0.00%
Proceeds from issuance of debt	$ 1,000,000,000
Less initial purchasers’ discount	(15,000,000)
Less other issuance costs	(904,000)
Net proceeds	984,096,000
Debt instrument, equity component	$ 241,300,000			$ 237,462,000
Conversion ratio	0.0092978
Conversion price | $ / shares				$ 107.55
Debt instrument, remaining useful life				5 years 10 months 24 days
Debt conversion, converted instrument, amount				$ 664,200,000
Debt instrument, if-converted value less than principal				(335,800,000)
Interest rate, effective percentage		4.63%
Debt issuance costs	$ (15,900,000)			$ (11,842,000)
Senior Notes | 0% Convertible Senior Notes Due 2026 | Debt Instrument, Liability Component
Debt Instrument [Line Items]
Debt issuance costs	(12,100,000)
Senior Notes | 0% Convertible Senior Notes Due 2026 | Debt Instrument, Equity Component
Debt Instrument [Line Items]
Debt issuance costs	(3,800,000)
Senior Notes | 0% Convertible Senior Notes Due 2026 | Carrying Amount
Debt Instrument [Line Items]
Convertible senior notes	758,700,000
Senior Notes | 0% Convertible Senior Notes Due 2026 | Capped Call
Debt Instrument [Line Items]
Net proceeds	103,400,000
Debt instrument, convertible (in shares) | shares				9,297,800
Conversion price | $ / shares				$ 156.44
Senior Notes | 0% Convertible Senior Notes Due 2026, Additional Notes
Debt Instrument [Line Items]
Face value	100,000,000
Senior Notes | 0.125% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Face value		$ 100,000,000		$ 800,000,000		$ 800,000,000	$ 700,000,000
Interest rate, stated percentage							0.125%
Proceeds from issuance of debt		800,000,000
Less initial purchasers’ discount		(18,998,000)
Less other issuance costs		(822,000)
Net proceeds		780,180,000
Debt instrument, equity component		$ 212,000,000.0		$ 206,747,000		206,747,000
Conversion ratio		0.0193956
Conversion price | $ / shares				$ 51.56
Debt instrument, remaining useful life				4 years 6 months
Debt conversion, converted instrument, amount				$ 1,108,500,000
Debt instrument, if-converted value in excess of principal				308,500,000
Interest rate, effective percentage		5.40%
Debt issuance costs		$ (19,800,000)		$ (10,862,000)		(12,691,000)
Senior Notes | 0.125% Convertible Senior Notes Due 2025 | Debt Instrument, Liability Component
Debt Instrument [Line Items]
Debt issuance costs		(14,600,000)
Senior Notes | 0.125% Convertible Senior Notes Due 2025 | Debt Instrument, Equity Component
Debt Instrument [Line Items]
Debt issuance costs		(5,300,000)
Senior Notes | 0.125% Convertible Senior Notes Due 2025 | Carrying Amount
Debt Instrument [Line Items]
Convertible senior notes		588,000,000.0
Senior Notes | 0.125% Convertible Senior Notes Due 2025 | Capped Call
Debt Instrument [Line Items]
Net proceeds		$ 97,200,000
Debt instrument, convertible (in shares) | shares				15,516,480
Conversion price | $ / shares				$ 79.32
Senior Notes | 0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Face value			$ 345,000,000	$ 173,018,000		345,000,000
Interest rate, stated percentage			0.25%
Proceeds from issuance of debt			$ 345,000,000
Less initial purchasers’ discount			(8,625,000)
Less other issuance costs			(757,000)
Net proceeds			335,618,000
Option to purchase additional notes			45,000,000
Repurchased principal amount	172,000,000.0
Aggregate consideration for principal amount exchanged	501,700,000
Repayments of convertible senior notes	$ 174,600,000
Debt conversion, shares issued (in shares) | shares	4,182,320
Debt conversion, shares issued, value	$ 327,100,000
Convertible senior notes	156,100,000
Debt instrument, equity component	345,600,000		$ 64,200,000	$ 31,316,000		62,444,000
Carrying amount	152,800,000
Gain (loss) on extinguishment of debt	$ (3,300,000)
Conversion ratio			0.0371051
Conversion price | $ / shares				$ 26.95
Debt instrument, remaining useful life				2 years 7 months 6 days
Debt conversion, converted instrument, amount				$ 458,600,000
Debt instrument, if-converted value in excess of principal				285,600,000
Interest rate, effective percentage			4.34%
Debt issuance costs			$ (9,400,000)	$ (1,960,000)		$ (5,028,000)
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Debt Instrument, Liability Component
Debt Instrument [Line Items]
Debt issuance costs			(7,600,000)
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Debt Instrument, Equity Component
Debt Instrument [Line Items]
Debt issuance costs			(1,700,000)
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Carrying Amount
Debt Instrument [Line Items]
Convertible senior notes			$ 280,800,000
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Sale Price Is Greater Or Equal 130%
Debt Instrument [Line Items]
Threshold trading days | day			20
Threshold consecutive trading days | day			30
Threshold percentage of stock price trigger			130.00%
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Trading Price Per $1,000 Principal Amount Less Than 98%
Debt Instrument [Line Items]
Threshold trading days | day			5
Threshold consecutive trading days | day			10
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Trading Price Per $1,000 Principal Amount Less Than 98% | Maximum
Debt Instrument [Line Items]
Threshold percentage of stock price trigger			98.00%
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Capped Call
Debt Instrument [Line Items]
Net proceeds			$ 39,200,000
Debt instrument, convertible, shares terminated (in shares) | shares	6,380,815
Proceeds from exercise of convertible senior notes capped call	$ 57,400,000
Debt instrument, convertible (in shares) | shares				6,419,850
Conversion price | $ / shares				$ 40.68

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