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Debt (Details)
12 Months Ended
May 28, 2019
USD ($)
tradingDay
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]      
Interest expense   $ 17,000,000 $ 10,000,000
Convertible debt   $ 255,000,000  
Maximum      
Debt Instrument [Line Items]      
Debt instrument, convertible, threshold consecutive trading days | tradingDay 30    
Minimum      
Debt Instrument [Line Items]      
Debt instrument, convertible, threshold consecutive trading days | tradingDay 20    
Convertible Notes Payable | 4% Convertible Senior Notes Due 2024      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 207,000,000    
Debt instrument, interest rate 4.00%    
Proceeds from debt, net of issuance costs $ 200,000,000    
Debt issuance costs, gross $ 7,000,000    
Debt issuance cost amortization period 5 years    
Debt conversion, converted instrument, shares issued (in shares) | shares 0.0448179    
Debt instrument, annual principal payment $ 1,000    
Debt instrument, conversion price (in dollars per share) | $ / shares $ 22.3125 $ 22.3125  
Debt instrument, redemption price, percentage 100.00%    
Debt instrument, interest rate   10.00%  
Debt instrument, carrying amount of equity component   $ 46,000,000  
Convertible debt     $ 205,000,000
Convertible Notes Payable | 4% Convertible Senior Notes Due 2024 | Maximum      
Debt Instrument [Line Items]      
Debt conversion, converted instrument, shares issued (in shares) | shares 0.0571428    
Debt instrument, percentage of stock price trigger 130.00%    
Convertible Notes Payable | 4% Convertible Senior Notes Due 2024 | Minimum      
Debt Instrument [Line Items]      
Debt instrument, percentage of stock price trigger 98.00%