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Long-term Debt (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Feb. 26, 2021
Feb. 08, 2021
Jul. 28, 2017
Dec. 17, 2012
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 30, 2016
Debt Instrument [Line Items]                  
Proceeds from the issuance of long-term debt           $ 6,000,000 $ 1,521,000 $ 289,000  
Long-term debt           2,875,000,000 3,131,250,000    
Issuance discount           18,337,000 24,351,000    
Loss on extinguishment of debt           2,908,000 0 $ 0  
Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Credit facility borrowing capacity           $ 500,000,000      
Revolving Credit Facility [Member] | Subsequent Event [Member]                  
Debt Instrument [Line Items]                  
Aggregate principal amount   $ 500,000,000              
Term-A Facility [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, covenant, cash flow ratio           5.25      
Minimum ratio of annual operating cash flow to annual total interest expense           2.50      
Term-A Facility [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Commitment fee percentage           0.25%      
Debt instrument, covenant, cash flow ratio           5.00      
Term-A Facility [Member] | Minimum [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate           0.25%      
Term-A Facility [Member] | Minimum [Member] | Eurodollar [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate           1.25%      
Term-A Facility [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Commitment fee percentage           0.50%      
Debt instrument, covenant, cash flow ratio           6.00      
Term-A Facility [Member] | Maximum [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate           1.25%      
Term-A Facility [Member] | Maximum [Member] | Eurodollar [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate           2.25%      
Term-A Facility [Member] | Secured Debt [Member]                  
Debt Instrument [Line Items]                  
Long-term debt     $ 675,000,000     $ 675,000,000 731,250,000    
Term-A Facility [Member] | Secured Debt [Member] | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Repayment of outstanding amount under loan facility     400,000,000            
Term-A Facility [Member] | Secured Debt [Member] | Subsequent Event [Member]                  
Debt Instrument [Line Items]                  
Aggregate principal amount   675,000,000              
4.75% Senior Notes Due 2025 [Member]                  
Debt Instrument [Line Items]                  
Debt, interest rate           4.75%      
4.75% Senior Notes Due 2025 [Member] | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Aggregate principal amount     800,000,000   $ 600,000,000        
Debt, interest rate           4.75%      
Long-term debt           $ 800,000,000 800,000,000    
Redemption price (as a percentage)           104.75%      
Redemption of notes         $ 200,000,000        
Underwriting discounts and commissions and expenses     $ 14,000,000.0            
Redemption percentage (up to)           35.00%      
4.75% Senior Notes Due 2025 [Member] | Debt Instrument, Redemption, Period One [Member] | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Redemption price (as a percentage)           102.375%      
4.75% Senior Notes Due 2025 [Member] | Debt Instrument, Redemption, Period Two [Member] | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Redemption price (as a percentage)           100.00%      
4.75% Senior Notes Due 2025 [Member] | US Treasury (UST) Interest Rate [Member] | Debt Instrument, Redemption, Period Two [Member] | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate           0.50%      
5.00% Senior Notes Due April 2024 [Member]                  
Debt Instrument [Line Items]                  
Debt, interest rate           5.00%      
5.00% Senior Notes Due April 2024 [Member] | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Aggregate principal amount                 $ 1,000,000,000.0
Debt, interest rate           5.00%      
Long-term debt           $ 1,000,000,000 1,000,000,000    
Issuance discount                 17,500,000
5.00% Senior Notes Due April 2024 [Member] | Subsequent Event [Member] | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Debt, interest rate 5.00%                
Redemption of principal amount $ 600,000,000                
Redemption price (as a percentage) 102.50%                
5.00% Senior Notes Due April 2024 [Member] | Debt Instrument, Redemption, Period One [Member] | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Redemption price (as a percentage)           102.50%      
5.00% Senior Notes Due April 2024 [Member] | Debt Instrument, Redemption, Period Two [Member] | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Redemption price (as a percentage)           100.00%      
7.75% Senior Notes [Member] | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Debt, interest rate           7.75%      
Debt extinguishment including principal interest and fees                 703,000,000
Debt proceeds used in redemption                 $ 45,600,000
4.75% Senior Notes Due December 2022 [Member]                  
Debt Instrument [Line Items]                  
Debt, interest rate           4.75%      
4.75% Senior Notes Due December 2022 [Member] | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Aggregate principal amount       $ 600,000,000          
Debt, interest rate           4.75%      
Long-term debt           $ 400,000,000 $ 600,000,000    
Redemption price (as a percentage)           100.00%      
Issuance discount       10,500,000          
Loss on extinguishment of debt           $ 2,900,000      
4.75% Senior Notes Due December 2022 [Member] | Subsequent Event [Member] | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Debt, interest rate 4.75%                
Redemption of principal amount $ 400,000,000                
Redemption price (as a percentage) 100.00%                
Term-B Facility [Member] | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Repayment of outstanding amount under loan facility       $ 587,600,000          
Other Debt [Member]                  
Debt Instrument [Line Items]                  
Debt, interest rate           3.50%      
Credit facility borrowing capacity           $ 3,000,000      
Outstanding borrowings on lines of credit           $ 0      
Other Debt [Member] | Prime Rate [Member]                  
Debt Instrument [Line Items]                  
Debt, interest rate           1.00%      
4.25% Senior Notes Due 2029 [Member] | Subsequent Event [Member] | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Aggregate principal amount   $ 1,000,000,000.0              
Debt, interest rate   4.25%              
Proceeds from the issuance of long-term debt   $ 982,300,000