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Financing Arrangements (Narrative) (Details) - USD ($)
$ in Millions
Apr. 11, 2018
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Fair value of debt instruments   $ 1,372.6 $ 1,343.3
Amount of long-term debt   1,353.9 1,309.0
Secured Debt | Senior secured term loan due 2022      
Debt Instrument [Line Items]      
Amount of long-term debt   $ 627.9 $ 629.0
Subsequent Event | Secured Debt | Senior secured term loan due 2022      
Debt Instrument [Line Items]      
Decrease in basis spread on variable rate 0.25%    
Stated interest rate 1.75%    
Subsequent Event | Secured Debt | Senior secured term loan due 2022 | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Basis point spread 1.75%    
Variable rate floor 0.75%    
Subsequent Event | Secured Debt | Senior secured term loan due 2022 | Prime Rate      
Debt Instrument [Line Items]      
Basis point spread 0.75%    
Variable rate floor 1.75%