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Long-Term Debt (Narrative) (Debt Extinguishment, Modification, and Issuance Costs) (Details) - USD ($)
 12 Months Ended
May 01, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Apr. 30, 2015
Debt Instrument [Line Items]          
Gain (loss) on debt extinguishment   $ (6,300,000) $ (400,000) $ 0  
Debt issuance costs   73,100,000 14,400,000    
Term Loan B Facility due 2023 [Member]          
Debt Instrument [Line Items]          
Capitalized debt issuance costs   66,600,000      
Lender fees   22,000,000      
Debt issuance costs   61,800,000 $ 0    
Line of Credit [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Capitalized debt issuance costs   8,200,000      
Write off of unamortized debt issuance costs   1,600,000      
Unamortized costs amortized over term of credit facility   2,000,000      
Senior Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Write off of unamortized debt issuance costs   400,000      
Credit facility, maximum borrowing capacity         $ 800,000,000
Debt issuance costs   2,100,000      
Senior Revolving Credit Facility [Member] | Letter of Credit [Member]          
Debt Instrument [Line Items]          
Credit facility, maximum borrowing capacity $ 1,000,000,000.0 15,000,000.0      
Period of debt, in years 5 years        
Eurocurrency Loans [Member] | Term Loan B Facility due 2023 [Member]          
Debt Instrument [Line Items]          
Debt extinguishment charge   4,700,000      
Write off of unamortized debt issuance costs   300,000      
Third party fees   4,300,000      
Lender fees   $ 100,000