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Debt - Capped Calls with Respect to 2024 Convertible Notes and 2026 Convertible Notes (Details) - Capped Calls with Respect to 2024 Convertible Notes and 2026 Convertible Notes
$ / shares in Units, $ in Millions
1 Months Ended
Aug. 31, 2019
USD ($)
$ / shares
$ / item
shares
Capped Calls  
Payment made to enter into Capped Calls $ 25.2
Strike price (in dollars per share) | $ / shares $ 13.39
Cap price | $ / item 17.05
Number of shares covered by capped calls (in shares) | shares 29,867,480
Purchase of capped calls $ 25.0
Equity component of issuance costs for convertible senior notes $ 0.2