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Debt - Narrative (Details)
3 Months Ended 9 Months Ended
May 28, 2019
USD ($)
tradingDay
$ / shares
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]            
Short-term borrowings   $ 3,000,000   $ 3,000,000   $ 3,000,000
Interest expense   $ 4,000,000 $ 4,000,000 $ 13,000,000 $ 6,000,000  
Minimum            
Debt Instrument [Line Items]            
Trading days | tradingDay 20          
Convertible Senior Notes | 4% Convertible Senior Dotes due 2024            
Debt Instrument [Line Items]            
Stated interest rate 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          
Initial conversion price (in dollars per share) | $ / shares $ 22.3125          
Threshold percentage of stock price trigger 130.00%          
Redemption price 100.00%          
Effective interest rate   10.00%   10.00%    
Equity component of notes   $ 46,000,000   $ 46,000,000    
Convertible debt fair value   $ 198,000,000   $ 198,000,000    
Debt instrument, convertible, conversion ratio 0.0448179000          
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