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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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