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Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 22, 2015
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 07, 2018
Debt Instrument [Line Items]          
Amortization of Financing Costs   $ 5.0 $ 8.0 $ 9.2  
Debt Issuance Costs, Net   $ 15.8 20.8    
Credit Agreement [Member]          
Debt Instrument [Line Items]          
Payments of Financing Costs     $ 53.1    
Senior Secured Term Loan [Member] | Credit Agreement [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate at Period End   3.05%      
Line of Credit [Member] | Credit Agreement [Member]          
Debt Instrument [Line Items]          
Letters of credit, amount outstanding   $ 1.0      
Eurodollar [Member] | Minimum | Line of Credit [Member] | Credit Agreement [Member]          
Debt Instrument [Line Items]          
Debt instrument, basis spread on varaible rate 1.25%        
Eurodollar [Member] | Maximum | Line of Credit [Member] | Credit Agreement [Member]          
Debt Instrument [Line Items]          
Debt instrument, basis spread on varaible rate 2.00%        
Base Rate [Member] | Minimum | Line of Credit [Member] | Credit Agreement [Member]          
Debt Instrument [Line Items]          
Debt instrument, basis spread on varaible rate 0.25%        
Base Rate [Member] | Maximum | Line of Credit [Member] | Credit Agreement [Member]          
Debt Instrument [Line Items]          
Debt instrument, basis spread on varaible rate 1.00%        
Revolving Credit Facility [Member] | Credit Agreement [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity         $ 1,000.0
Debt Instrument, Covenant Compliance, Net Debt To EBITDA         3.50
Debt Instrument, Covenant Compliance, EBITDA To Cash Interest Expense, Minimum         3.50
Revolving Credit Facility [Member] | Line of Credit [Member] | Credit Agreement [Member]          
Debt Instrument [Line Items]          
Long-term debt   250.0      
Senior Secured Term Loan [Member] | Line of Credit [Member] | Credit Agreement [Member]          
Debt Instrument [Line Items]          
Debt instrument, principal amount         $ 2,612.5
Debt Instrument, Quarterly Payment, Percentage of Total Borrowings         5.00%
Principal payments   (98.0)      
Long-term debt   $ 2,514.5