Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Derivatives (Details)

v3.19.2
Basis of Presentation and Summary of Significant Accounting Policies - Derivatives (Details) - Convertible Notes - 2019 Convertible Senior Notes
Jun. 30, 2019
yr
$ / shares
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Common stock price (USD per share) $ 114.15
Exercise price, conversion premium and bond hedge (USD per share) $ 75.05
Risk-free interest rate  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Measurement input (as a percent) 0.0221
Volatility  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Measurement input (as a percent) 0.35
Dividend yield  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Measurement input (as a percent) 0
Remaining contractual term (in years)  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Measurement input (as a percent) | yr 0.13