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Convertible Senior Notes - Narrative (Details)		3 Months Ended
	Sep. 25, 2020 USD ($) day $ / shares shares	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Purchase of convertible note hedge	$ 100,600,000
Proceeds from sale of warrants	51,300,000
Convertible Note Hedge
Debt Instrument [Line Items]
Deferred tax asset related to the convertible note hedge transaction	$ 25,800,000
Convertible Note Hedge Rights
Debt Instrument [Line Items]
Options and warrants to purchase shares (in shares) | shares	5,900,000
Strike price (in dollars per share) | $ / shares	$ 97.32
Warrant
Debt Instrument [Line Items]
Options and warrants to purchase shares (in shares) | shares	5,900,000
Strike price (in dollars per share) | $ / shares	$ 141.56
Convertible Senior Notes | Convertible Debt
Debt Instrument [Line Items]
Interest rate	0.25%
Aggregate principal amount	$ 575,000,000.0
Additional principal amount subject to purchasers' option	75,000,000.0
Proceeds from issuance of convertible senior notes, net of issuance costs	559,700,000
Debt issuance costs incurred and capitalized	$ 15,300,000
Conversion ratio	0.0102751
Conversion price (in dollars per share) | $ / shares	$ 97.32
Repurchase price as a percent of principal amount	100.00%
Aggregate principal amount of Notes that must be outstanding and not subject to redemption if the Company redeems less than all of the Notes	$ 150,000,000.0
Carrying value of debt	461,800,000	$ 472,347,000	$ 467,201,000
Equity component of convertible senior notes	$ 72,700,000	$ 72,732,000	$ 72,732,000
Effective interest rate		4.18%
Remaining life of debt discount and issuance cost accretion		4 years 6 months
Maximum number of shares issuable upon conversion (in shares) | shares	8,100,000
Excess principal amount over the if-converted value		$ 192,300,000
Convertible Senior Notes | Convertible Debt | Period 1
Debt Instrument [Line Items]
Threshold trading days | day	20
Threshold consecutive trading days | day	30
Threshold percentage of stock price trigger	130.00%
Convertible Senior Notes | Convertible Debt | Period 2
Debt Instrument [Line Items]
Threshold trading days | day	5
Threshold consecutive trading days | day	10
Threshold percentage of stock price trigger	98.00%

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