Convertible Senior Notes - Narrative (Details) $ / shares in Units, shares in Millions	1 Months Ended
Sep. 30, 2018 USD ($) trading_day $ / shares shares	Apr. 30, 2019 USD ($)
Convertible Senior Notes Due 2023 \| Convertible Debt
Debt Conversion [Line Items]
Aggregate principal amount of debt issued	$ 575,000,000.0	$ 575,000,000.0
Debt interest rate percentage		0.50%
Additional principal amount purchased	75,000,000.0
Proceeds from issuance of debt	$ 560,800,000
Conversion rate	0.013986
Conversion price (in usd per share) \| $ / shares	$ 71.50
Percentage of principal amount redeemed	100.00%
Trading days \| trading_day	20
Consecutive trading days \| trading_day	30
Percentage of conversion price	130.00%
Equity component of conversion option		$ 134,667,000
Transaction costs attributable to liability component		10,900,000
Transaction costs attributable to equity components		$ 3,336,000
Capped Calls
Debt Conversion [Line Items]
Conversion price (in usd per share) \| $ / shares	$ 71.50
Initial cap price (in usd per share) \| $ / shares	$ 110.00
Shares covered by capped calls (in shares) \| shares	8.0
Costs incurred for capped calls	$ 67,600,000
Conversion Covenant One \| Convertible Senior Notes Due 2023 \| Convertible Debt
Debt Conversion [Line Items]
Trading days \| trading_day	20
Consecutive trading days \| trading_day	30
Percentage of conversion price	130.00%
Conversion Covenant Two \| Convertible Senior Notes Due 2023 \| Convertible Debt
Debt Conversion [Line Items]
Trading days \| trading_day	5
Consecutive trading days \| trading_day	10
Percentage of conversion price	98.00%
Measurement Input, Discount Rate \| Convertible Senior Notes Due 2023 \| Convertible Debt
Debt Conversion [Line Items]
Discount rate		0.06

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