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DEBT - Convertible Senior Notes due in 2028 Narrative (Details)
$ / shares in Units, shares in Millions
9 Months Ended
Mar. 01, 2021
USD ($)
trading_day
$ / shares
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]        
Deferred taxes   $ 133,158,000   $ 92,904,000
Payment for bonds hedge   286,235,000 $ 89,056,000  
Proceeds from sale of warrants   220,800,000 $ 71,552,000  
Convertible Notes | Convertible Senior Notes Due 2028        
Debt Instrument [Line Items]        
Debt instrument face amount $ 575,000,000      
Interest rate 0.00%      
Proceeds from convertible debt $ 566,400,000      
Conversion ratio 0.0035104      
Debt conversion price (in USD per share) | $ / shares $ 284.87      
Convertible note, liability component $ 415,000,000      
Convertible note, equity component 160,000,000      
Deferred taxes   40,100,000    
Debt issuance costs 9,100,000      
Unamortized debt issuance costs 6,600,000 6,000,000    
Debt issuance costs, allocated to capital $ 2,500,000      
Unamortized discount   $ 148,600,000    
Remaining discount amortization period   6 years 4 months 24 days    
Conversion shares (in shares) | shares 2.0      
Payment for bonds hedge $ 161,600,000      
Warrants issued, strike price (in USD per share) | $ / shares $ 397.91      
Proceeds from sale of warrants $ 123,400,000      
Convertible Notes | Convertible Senior Notes Due 2028 | Discount rate        
Debt Instrument [Line Items]        
Measurement input   0.0477    
Period One | Convertible Notes | Convertible Senior Notes Due 2028        
Debt Instrument [Line Items]        
Threshold percentage 130.00%      
Stock trigger price (in USD per share) | $ / shares $ 370.33      
Number of threshold trading days | trading_day 20      
Number of consecutive trading days | trading_day 30      
Measurement period percentage of stock price trigger 98.00%      
Period Two | Convertible Notes | Convertible Senior Notes Due 2028        
Debt Instrument [Line Items]        
Threshold percentage 100.00%      
Number of consecutive trading days | trading_day 5      
Business day period after measurement period 5 days