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Debt and Credit Arrangements - 2024 Notes Narratives (Details) $ / shares in Units, shares in Thousands			1 Months Ended	3 Months Ended
	Apr. 01, 2021 day $ / shares	Nov. 06, 2017 USD ($)	Dec. 31, 2017 USD ($) $ / shares	Mar. 31, 2021 USD ($) day $ / shares	Dec. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2018 shares	Oct. 31, 2017 $ / shares
Debt Instrument
Share price (usd per share) | $ / shares				$ 142.35				$ 43.50
Convertible Debt | Convertible Notes, due 2024
Debt Instrument
Debt instrument stated interest rate (percent)		1.00%
Debt instrument face amount		$ 258,800,000		$ 258,800,000	$ 258,800,000	$ 258,800,000
Share conversion rate(per share)		0.0170285
Debt instrument, conversion price (usd per share) | $ / shares				$ 58.725
Debt instrument, conversion premium				35.00%
Value of securities above principal amount of debt if converted				$ 368,500,000
Debt instrument, threshold for consecutive trading days | day				20
Debt instrument, threshold for consecutive trading days | day				30
Applicable conversion price threshold (as percentage)				130.00%
Maximum days after five trading days				5 days
Applicable conversion price, less than (as percentage)				97.00%
Debt instrument effective interest rate		4.80%
Non cash payment for derivative instrument			$ 59,500,000
Number of shares underlying warrant | shares							4,410
Proceeds from issuances of warrants			$ 46,000,000.0
Percentage above previous sales price								65.00%
Net cost of convertible note hedge and warrant				$ 13,500,000
Convertible Debt | Convertible Notes, due 2024 | Subsequent Event
Debt Instrument
Debt instrument, conversion price (usd per share) | $ / shares	$ 76.3425
Debt instrument, threshold for consecutive trading days | day	20
Applicable conversion price threshold (as percentage)	130.00%
Convertible Debt | Convertible Notes, due 2024 | Maximum
Debt Instrument
Debt instrument, conversion price (usd per share) | $ / shares			$ 71.775
Convertible Debt | Convertible Notes, due 2024 | Liability Component
Debt Instrument
Debt instrument face amount		$ 200,100,000
Debt issuance costs		5,300,000
Convertible Debt | Convertible Notes, due 2024 | Equity Component
Debt Instrument
Debt instrument face amount		58,700,000
Debt issuance costs		$ 1,500,000

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