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
|