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Debt - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2021
USD ($)
day
$ / shares
Jan. 31, 2018
USD ($)
day
$ / shares
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]              
Underwriting discounts and commissions and other offering expenses     $ 12,080,000   $ 12,080,000   $ 5,646,000
Net proceeds         575,000,000 $ 0  
Loss on extinguishment of debt     0 $ 0 17,689,000 $ 0  
0.75% convertible senior notes due 2028              
Debt Instrument [Line Items]              
Initial conversion rate 0.0307692            
1.75% convertible senior notes due 2025              
Debt Instrument [Line Items]              
Initial conversion rate   0.0255384          
Convertible Notes | 0.75% convertible senior notes due 2028              
Debt Instrument [Line Items]              
Aggregate principal amount $ 575,000,000            
Option to purchase additional debt 75,000,000            
Underwriting discounts and commissions and other offering expenses 15,700,000   9,800,000   $ 9,800,000    
Net proceeds $ 559,300,000            
Initial conversion price (in dollars per share) | $ / shares $ 32.50            
Convertible senior notes $ 371,600,000            
Effective interest rate 7.10%            
Equity component of convertible debt $ 203,400,000            
Remaining discount amortization period         6 years 8 months 1 day    
Convertible Notes | 0.75% convertible senior notes due 2028 | Conversion Term (i)              
Debt Instrument [Line Items]              
Threshold trading days | day 5            
Threshold consecutive trading days | day 5            
Threshold percent of stock price trigger 98.00%            
Convertible Notes | 0.75% convertible senior notes due 2028 | Conversion Term (ii)              
Debt Instrument [Line Items]              
Threshold trading days | day 45            
Threshold consecutive trading days | day 10            
Threshold percent of stock price trigger 10.00%            
Convertible Notes | 0.75% convertible senior notes due 2028 | Conversion Term (iii)              
Debt Instrument [Line Items]              
Threshold trading days following fundamental change | day 30            
Convertible Notes | 0.75% convertible senior notes due 2028 | Conversion Term (iv)              
Debt Instrument [Line Items]              
Threshold trading days | day 20            
Threshold consecutive trading days | day 30            
Threshold percent of stock price trigger 130.00%            
Convertible Notes | 1.75% convertible senior notes due 2025              
Debt Instrument [Line Items]              
Aggregate principal amount   $ 450,000,000          
Option to purchase additional debt   50,000,000          
Underwriting discounts and commissions and other offering expenses   14,200,000 $ 2,300,000   $ 2,300,000    
Net proceeds   $ 435,800,000          
Repurchased amount $ 225,000,000            
Loss on extinguishment of debt $ 17,700,000            
Initial conversion price (in dollars per share) | $ / shares   $ 39.16          
Convertible senior notes   $ 309,100,000          
Effective interest rate   7.60%          
Equity component of convertible debt   $ 140,900,000          
Remaining discount amortization period         3 years 3 months 14 days    
Convertible Notes | 1.75% convertible senior notes due 2025 | Conversion Term (i)              
Debt Instrument [Line Items]              
Threshold trading days | day   5          
Threshold consecutive trading days | day   5          
Threshold percent of stock price trigger   98.00%          
Convertible Notes | 1.75% convertible senior notes due 2025 | Conversion Term (ii)              
Debt Instrument [Line Items]              
Threshold trading days | day   45          
Threshold consecutive trading days | day   10          
Threshold percent of stock price trigger   10.00%          
Convertible Notes | 1.75% convertible senior notes due 2025 | Conversion Term (iii)              
Debt Instrument [Line Items]              
Threshold trading days following fundamental change | day   30          
Convertible Notes | 1.75% convertible senior notes due 2025 | Conversion Term (iv)              
Debt Instrument [Line Items]              
Threshold trading days | day   20          
Threshold consecutive trading days | day   30          
Threshold percent of stock price trigger   130.00%