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Convertible Senior Notes - Additional Information (Details)	1 Months Ended				3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) shares	Aug. 31, 2020 USD ($)	Apr. 30, 2019 USD ($)	Apr. 30, 2018 USD ($) day	Sep. 30, 2021 USD ($) $ / shares	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) shares	Mar. 31, 2019 USD ($)
Debt Instrument [Line Items]
Repayments of convertible senior notes							$ 300,755,000	$ 159,677,000
Equity component on conversions of 2023 notes and 2025 notes						$ 237,462,000	(236,920,000)	237,462,000
Proceeds from exercise of convertible senior notes capped call							69,005,000	57,414,000
Loss on early extinguishment of debt					$ 0	$ 3,315,000	78,152,000	$ 3,315,000
Senior Notes | 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 | 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 | 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 | Fundamental Change Scenario
Debt Instrument [Line Items]
Threshold percentage of stock price trigger				100.00%
Senior Notes | 2026 Notes
Debt Instrument [Line Items]
Face value		$ 1,000,000,000			$ 1,000,000,000		$ 1,000,000,000		$ 1,000,000,000
Interest rate, stated percentage		0.00%
Proceeds from issuance of debt		$ 1,000,000,000
Conversion ratio		0.0092978
Conversion price (in dollars per share) | $ / shares					$ 107.55		$ 107.55
Senior Notes | 2026 Notes | Capped Call
Debt Instrument [Line Items]
Conversion price (in dollars per share) | $ / shares					$ 156.44		$ 156.44
Senior Notes | 0% Convertible Senior Notes Due 2026, Additional Notes
Debt Instrument [Line Items]
Face value		$ 100,000,000
Senior Notes | 2025 Notes
Debt Instrument [Line Items]
Face value			$ 100,000,000		$ 699,989,000		$ 699,989,000		800,000,000	$ 700,000,000
Interest rate, stated percentage										0.125%
Proceeds from issuance of debt			$ 800,000,000
Repurchased principal amount					$ 100,000,000		100,000,000
Repayments of convertible senior notes	$ 184,900,000						$ 184,900,000
Carrying amount	98,300,000
Debt extinguished	100,000,000
Derivative liability	176,500,000
Gain (loss) in change in fair value	(8,400,000)
Loss on early extinguishment of debt	$ 78,200,000
Conversion ratio			0.0193956
Conversion price (in dollars per share) | $ / shares					$ 51.56		$ 51.56
Senior Notes | 2025 Notes | Capped Call
Debt Instrument [Line Items]
Debt instrument, convertible, shares terminated (in shares) | shares	1,939,560
Proceeds from exercise of convertible senior notes capped call	$ 23,900,000
Derivative liability	22,600,000
Gain (loss) in change in fair value	$ 1,300,000
Conversion price (in dollars per share) | $ / shares					$ 79.32		$ 79.32
Senior Notes | 2023 Notes
Debt Instrument [Line Items]
Face value				$ 345,000,000					115,576,000
Interest rate, stated percentage				0.25%
Proceeds from issuance of debt				$ 345,000,000
Option to purchase additional notes				$ 45,000,000
Repurchased principal amount					$ 115,600,000		$ 115,600,000
Aggregate consideration							351,100,000
Repayments of convertible senior notes							$ 115,600,000
Debt conversion, shares issued (in shares) | shares							2,983,011
Debt conversion, shares issued, value							$ 235,500,000
Carrying amount					$ 114,200,000		114,200,000
Equity component on conversions of 2023 notes and 2025 notes							$ 236,900,000
Conversion ratio				0.0371051
Conversion price (in dollars per share) | $ / shares					$ 26.95		$ 26.95
Senior Notes | 2023 Notes | Requests For Conversions
Debt Instrument [Line Items]
Repurchased principal amount					$ 24,700,000		$ 24,700,000
Senior Notes | 2023 Notes | Election Of Option To Redeem Outstanding Notes
Debt Instrument [Line Items]
Repurchased principal amount					$ 90,900,000		$ 90,900,000
Senior Notes | 2023 Notes | Capped Call
Debt Instrument [Line Items]
Debt instrument, convertible, shares terminated (in shares) | shares							4,288,459
Proceeds from exercise of convertible senior notes capped call							$ 45,200,000
Senior Notes | 2023 Notes | Exchange Of Aggregate Principal Amount
Debt Instrument [Line Items]
Repurchased principal amount									172,000,000
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
Aggregate consideration for principal amount exchanged									$ 501,700,000

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