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Condensed Consolidated Financial Statements, Accounting Standards Updates (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Contract
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Contract
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
New Accounting Pronouncements [Abstract]          
Selling and administrative expenses $ 107.7 $ 111.0 $ 330.4 $ 338.9  
Number of contracts | Contract 2   2    
Interest Rate Swap [Member]          
New Accounting Pronouncements [Abstract]          
Number of contracts | Contract 11   11    
Interest Rate Swap [Member] | LIBOR [Member]          
New Accounting Pronouncements [Abstract]          
Long-term debt hedged $ 1,025.0   $ 1,025.0    
ASU 2017-07 [Member]          
New Accounting Pronouncements [Abstract]          
Selling and administrative expenses   (0.1)   (0.2)  
Other income, net   $ 0.1   $ 0.2  
ASU 2017-12 [Member] | Interest Rate Swap [Member]          
New Accounting Pronouncements [Abstract]          
Number of contracts | Contract 12   12    
ASU 2017-12 [Member] | Interest Rate Swap [Member] | LIBOR [Member]          
New Accounting Pronouncements [Abstract]          
Long-term debt hedged $ 1,125.0   $ 1,125.0    
ASU 2017-12 [Member] | Accumulated Deficit [Member]          
New Accounting Pronouncements [Abstract]          
Cumulative effect adjustment         $ (0.3)
ASU 2017-12 [Member] | Accumulated Other Comprehensive Loss [Member]          
New Accounting Pronouncements [Abstract]          
Cumulative effect adjustment [1]         $ 0.3
[1] All amounts are net of tax. Amounts in parentheses indicate debits.