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Debt - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 02, 2020
Jan. 31, 2020
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]              
Gain (loss) on debt repayment     $ (5,000,000) $ (5,000,000) $ 17,000,000    
Repayment of principal amount outstanding       $ 600,000,000 $ 0    
4.375% Notes              
Debt Instrument [Line Items]              
Percentage of contractual interest rate on notes     4.375% 4.375%      
4.875% Notes due 2025              
Debt Instrument [Line Items]              
Percentage of contractual interest rate on notes     4.875% 4.875%      
5.375% Notes              
Debt Instrument [Line Items]              
Percentage of contractual interest rate on notes     5.375% 5.375%      
1.125% Convertible notes              
Debt Instrument [Line Items]              
Percentage of contractual interest rate on notes     1.125% 1.125%      
Term loan facility              
Debt Instrument [Line Items]              
Debt term       5 years      
Term loan facility | Incremental Term Loan              
Debt Instrument [Line Items]              
Face amount     $ 500,000,000 $ 500,000,000   $ 150,000,000  
Consolidated net leverage ratio     3 3      
Term loan facility | Credit facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity     $ 1,000,000,000.0 $ 1,000,000,000.0   $ 500,000,000  
Amount outstanding under letter of credit     0 0      
Term loan facility | Swingline sub facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity     15,000,000 15,000,000      
Term loan facility | Letter of credit sub-facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity     100,000,000 100,000,000      
Senior notes | 4.375% Notes              
Debt Instrument [Line Items]              
Face amount $ 800,000,000            
Percentage of contractual interest rate on notes 4.375%            
Deferred issuance cost $ 11,000,000            
Senior notes | 4.875% Notes due 2025              
Debt Instrument [Line Items]              
Face amount     $ 330,000,000 $ 330,000,000      
Percentage of contractual interest rate on notes     4.875% 4.875%      
Senior notes | 5.375% Notes              
Debt Instrument [Line Items]              
Face amount     $ 700,000,000 $ 700,000,000      
Percentage of contractual interest rate on notes     5.375% 5.375%      
Convertible debt | 4.375% Notes              
Debt Instrument [Line Items]              
Repayment of principal amount outstanding $ 600,000,000            
Convertible debt | 1.125% Convertible notes              
Debt Instrument [Line Items]              
Percentage of contractual interest rate on notes     1.125% 1.125%     1.125%
Repayments of debt   $ 39,000,000          
Debt net of unamortized discount     $ 0 $ 0     $ 12,000,000