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Long-term Debt (Summary of Long-Term Debt) (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term debt $ 2,926,875,000 $ 3,131,250,000
Unamortized discount (22,058,000) (24,351,000)
Unamortized deferred financing costs (9,722,000) (10,670,000)
Long-term debt, net 2,895,095,000 3,096,229,000
Current portion of long-term debt 70,625,000 56,250,000
Long-term debt $ 2,824,470,000 3,039,979,000
4.75% Notes due August 2025    
Debt Instrument [Line Items]    
Interest rate 4.75%  
5.00% Notes due April 2024    
Debt Instrument [Line Items]    
Interest rate 5.00%  
4.75% Notes due December 2022    
Debt Instrument [Line Items]    
Interest rate 4.75%  
Senior Notes | 4.75% Notes due August 2025    
Debt Instrument [Line Items]    
Interest rate 4.75%  
Long-term debt $ 800,000,000 800,000,000
Senior Notes | 5.00% Notes due April 2024    
Debt Instrument [Line Items]    
Interest rate 5.00%  
Long-term debt $ 1,000,000,000 1,000,000,000
Senior Notes | 4.75% Notes due December 2022    
Debt Instrument [Line Items]    
Interest rate 4.75%  
Long-term debt $ 400,000,000 600,000,000
Long-term debt, net 600,000,000  
Senior Notes | Other debt    
Debt Instrument [Line Items]    
Long-term debt 5,000,000 0
Credit facilities | Subsidiary Credit Facilities    
Debt Instrument [Line Items]    
Long-term debt 5,000,000.0  
Total credit facilities $ 7,000,000.0  
Credit facilities | Subsidiary Credit Facilities | Minimum    
Debt Instrument [Line Items]    
Interest rate 3.50%  
Secured debt | Term Loan A Facility    
Debt Instrument [Line Items]    
Long-term debt [1] $ 721,875,000 $ 731,250,000
Revolving credit facility    
Debt Instrument [Line Items]    
Remaining undrawn capacity $ 500,000,000  
[1] The Company's $500 million revolving credit facility remains undrawn at March 31, 2020. Total undrawn revolver commitments are available to be drawn for general corporate purposes of the Company. (b)A majority owned subsidiary of the Company has credit facilities totaling $7.0 million, which bear interest at the greater of 3.5% or the prime rate and mature on August 25, 2020. As of March 31, 2020, there was $5.0 million of outstanding borrowings on the credit facilities.