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Debt - Narrative (Details)
3 Months Ended 6 Months Ended
May 28, 2019
USD ($)
trading_day
$ / shares
Jun. 30, 2021
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Debt Instrument [Line Items]          
Interest expense   $ 5,000,000 $ 4,000,000 $ 9,000,000 $ 8,000,000
Minimum          
Debt Instrument [Line Items]          
Trading days | trading_day 20        
Maximum          
Debt Instrument [Line Items]          
Trading days | trading_day 30        
Convertible Senior Notes | 4% Convertible Senior Dotes due 2024          
Debt Instrument [Line Items]          
Stated interest rate (percent) 4.00% 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   $ 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%   10.00%  
Equity component of notes   $ 46,000,000   $ 46,000,000  
Convertible debt fair value   $ 263,000,000   $ 263,000,000  
Convertible Senior Notes | 4% Convertible Senior Dotes due 2024 | Minimum          
Debt Instrument [Line Items]          
Threshold percentage of stock price trigger 98.00%        
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%