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Debt - Narrative (Details)
3 Months Ended
May 28, 2019
USD ($)
trading_day
$ / shares
Mar. 31, 2021
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
Debt Instrument [Line Items]      
Interest expense   $ 4,000,000 $ 4,000,000
Maximum      
Debt Instrument [Line Items]      
Trading days | trading_day 30    
Minimum      
Debt Instrument [Line Items]      
Trading days | trading_day 20    
Convertible Senior Notes | 4% Convertible Senior Dotes due 2024      
Debt Instrument [Line Items]      
Stated interest rate (percent) 4.00% 4.00%  
Aggregate principal amount of debt $ 207,000,000    
Net proceeds 200,000,000    
Debt issuance costs $ 7,000,000    
Amortization period of interest expense 5 years    
Debt instrument, annual principal payment $ 1,000    
Debt instrument, convertible, conversion ratio 0.0448179000    
Initial conversion price (in dollars per share) | $ / shares $ 22.3125 $ 22.3125  
Threshold percentage of stock price trigger 130.00%    
Redemption price 100.00%    
Measurement period, number of days after 5 days    
Measurement period 10 days    
Effective interest rate   10.00%  
Equity component of notes   $ 46,000,000  
Convertible debt fair value   $ 269,000,000  
Convertible Senior Notes | 4% Convertible Senior Dotes due 2024 | Maximum      
Debt Instrument [Line Items]      
Debt instrument, convertible, conversion ratio 0.0571428000    
Threshold percentage of stock price trigger 130.00%    
Convertible Senior Notes | 4% Convertible Senior Dotes due 2024 | Minimum      
Debt Instrument [Line Items]      
Threshold percentage of stock price trigger 98.00%