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Convertible Senior Notes - Narrative (Details)				3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares	Apr. 14, 2020 USD ($) day $ / shares	Apr. 09, 2020 USD ($)	Mar. 31, 2021 USD ($) day $ / shares shares	Apr. 08, 2020 $ / instrument
Line of Credit Facility [Line Items]
Amount borrowed		$ 1,000
Share price (in USD per share) | $ / shares	$ 46.77			$ 46.77
Cash Flow Hedging | Capped Call | Designated as Hedging Instrument
Line of Credit Facility [Line Items]
Derivative, cost of hedge			$ 21,700,000
Cap price (in dollars per share) | $ / instrument					42.00
Convertible Notes Payable
Line of Credit Facility [Line Items]
Convertible debt liability component fair value disclosure		63,300,000
Senior Notes Due 2025 | Convertible Notes Payable
Line of Credit Facility [Line Items]
Proceeds allocated to the conversion option (debt discount)	$ 63,270,000	$ 230,000,000.0		$ 63,270,000
Basis rate (in percentage)		2.50%
Proceeds from issuance of debt		$ 222,500,000
Debt instrument, convertible, threshold percentage of stock price trigger		130.00%		130.00%
Threshold trading days | day		20		20
Threshold consecutive trading days | day		30		30
Redemption price, percentage		100.00%
Number of shares issued in conversion (in shares) | shares				0.00326797
Amount borrowed	$ 391,300,000	$ 230,000,000.0		$ 391,300,000
Conversion price (in dollars per share) | $ / shares	$ 30.60	$ 30.60		$ 30.60
Convertible debt liability component fair value disclosure		$ 166,700,000
Debt issuance cost gross liability component		5,500,000
Debt issuance cost gross equity component		$ 2,100,000
Debt instrument, convertible, if-converted value in excess of principal	$ 121,500,000
Senior Notes Due 2025 | Convertible Notes Payable | Measurement Input, Discount Rate
Line of Credit Facility [Line Items]
Debt instrument, measurement input		0.10
Senior Notes Due 2025 | Convertible Notes Payable | Debt Instrument Convertible Sale Price Of Stock Threshold
Line of Credit Facility [Line Items]
Debt instrument, convertible, threshold percentage of stock price trigger		98.00%
Threshold trading days | day		5

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Debt Instrument Convertible Carrying Amount Of Equity Component Gross

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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The price per share of the conversion feature embedded in the debt instrument.

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The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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