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Debt - Narrative (Details)
3 Months Ended 9 Months Ended
May 28, 2019
USD ($)
trading_day
$ / shares
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
Dec. 01, 2019
Debt Instrument [Line Items]              
Interest expense   $ 5,000,000 $ 4,000,000 $ 14,000,000 $ 13,000,000    
Minimum              
Debt Instrument [Line Items]              
Trading days | trading_day 20            
Maximum              
Debt Instrument [Line Items]              
Trading days | trading_day 30            
Convertible Senior Notes | 4.00% Convertible Senior Notes              
Debt Instrument [Line Items]              
Stated interest rate 4.00% 4.00%   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, convertible, conversion ratio 0.0448179000            
Debt instrument, annual principal payment $ 1,000            
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   $ 334,000,000   $ 334,000,000      
Convertible Senior Notes | 4.00% Convertible Senior Notes | Minimum              
Debt Instrument [Line Items]              
Threshold percentage of stock price trigger 98.00%            
Convertible Senior Notes | 4.00% Convertible Senior Notes | Maximum              
Debt Instrument [Line Items]              
Debt instrument, convertible, conversion ratio 0.0571428000            
Threshold percentage of stock price trigger 130.00%