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Debt, Commitments and Contingencies - Convertible Senior Notes (Details)
6 Months Ended
Jan. 20, 2021
USD ($)
day
$ / shares
Jun. 30, 2021
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Oct. 06, 2017
USD ($)
Debt Instrument [Line Items]            
Proceeds from convertible debt   $ 500,000,000 $ 0      
Share price (in dollars per share) | $ / shares   $ 84.70        
Convertible Senior Notes due 2026            
Debt Instrument [Line Items]            
Proceeds from convertible debt $ 484,300,000          
Debt issuance costs $ 15,700,000          
Debt instrument, redemption price, percentage 100.00%          
Conversion ratio 6.7939          
Conversion price (in dollars per share) | $ / shares $ 147.19          
Liability component of debt issuance costs, amortized and unamortized $ 13,300,000          
Debt discount and debt issuance cost deferred tax liability       $ 18,300,000    
Convertible Senior Notes due 2026 | Redemption period one            
Debt Instrument [Line Items]            
Debt instrument, redemption price, percentage 100.00%          
Threshold percentage stock price trigger 130.00%          
Trading days threshold | day 20          
Consecutive trading days threshold | day 30          
Convertible Senior Notes due 2026 | Redemption period two            
Debt Instrument [Line Items]            
Threshold percentage stock price trigger 130.00%          
Trading days threshold | day 20          
Consecutive trading days threshold | day 30          
Number of business days | day 5          
Number of consecutive trading days | day 10          
Percentage of last reported sale price threshold 98.00%          
Senior Notes | Convertible Senior Notes due 2026            
Debt Instrument [Line Items]            
Debt instrument, face amount $ 500,000,000.0          
Debt instrument, interest rate 0.00%          
Effective interest rate 4.00%          
Debt instrument, fair value   $ 467,100,000        
Revolving Credit Facility | Line of Credit | 2017 Facility            
Debt Instrument [Line Items]            
Long-term debt $ 110,000,000.0 $ 0     $ 110,000,000.0 $ 72,000,000.0