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Convertible Senior Notes (Details)	1 Months Ended				3 Months Ended
	Apr. 30, 2021 USD ($) shares	Aug. 31, 2020 USD ($) shares	Apr. 30, 2019 USD ($)	Apr. 30, 2018 USD ($) day	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)
Debt Instrument [Line Items]
Repayments of convertible senior notes					$ 189,849,000	$ 0
Loss on early extinguishment of debt					(78,152,000)	0
Proceeds from exercise of convertible senior notes capped call					24,812,000	$ 0
0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Debt conversion, converted amount					24,700,000
Senior Notes | 0% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Face value		$ 1,000,000,000.0			$ 1,000,000,000		$ 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
Conversion ratio		0.0092978
Conversion price | $ / shares					$ 107.55
Senior Notes | 0% Convertible Senior Notes Due 2026 | Capped Call
Debt Instrument [Line Items]
Net proceeds		$ 103,400,000
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		$ 699,995,000		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
Repurchased principal amount					100,000,000.0
Repayments of convertible senior notes					184,900,000
Derivative liability					176,500,000
Gain (loss) in change in fair value					$ (8,400,000)
Carrying amount		98,300,000
Loss on early extinguishment of debt		$ (78,200,000)
Conversion ratio			0.0193956
Conversion price | $ / shares					$ 51.56
Senior Notes | 0.125% Convertible Senior Notes Due 2025 | Capped Call
Debt Instrument [Line Items]
Net proceeds			$ 97,200,000
Derivative liability					$ 22,600,000
Gain (loss) in change in fair value					$ 1,300,000
Debt instrument, convertible, shares terminated (in shares) | shares		1,939,560
Proceeds from exercise of convertible senior notes capped call		$ 23,900,000
Conversion price | $ / shares					$ 79.32
Senior Notes | 0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Face value				$ 345,000,000	$ 110,896,000		115,576,000
Interest rate, stated percentage				0.25%
Option to purchase additional notes				$ 45,000,000
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
Repayments of convertible senior notes					$ 4,700,000
Conversion ratio				0.0371051
Conversion price | $ / shares					$ 26.95
Debt conversion, converted amount					$ 4,700,000
Debt conversion, consideration					$ 15,900,000
Debt conversion, equity instruments issued (in shares) | shares					126,003
Debt conversion, equity instruments issued, amount					$ 11,200,000
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Subsequent Event
Debt Instrument [Line Items]
Repayments of convertible senior notes	$ 20,000,000.0
Debt conversion, converted amount	20,000,000.0
Debt conversion, consideration	$ 67,100,000
Debt conversion, equity instruments issued (in shares) | shares	529,611
Debt conversion, equity instruments issued, amount	$ 47,100,000
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					86,826
Conversion price | $ / shares					$ 40.68
Proceeds from capped call					$ 900,000
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Exchange Of Aggregate Principal Amount
Debt Instrument [Line Items]
Repurchased principal amount							$ 172,000,000.0
Repayments of convertible senior notes					174,600,000
Aggregate consideration for principal amount exchanged					$ 501,700,000
Debt conversion, shares issued (in shares) | shares					4,182,320
Debt conversion, shares issued, value					$ 327,100,000

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