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Financial Instruments Schedule of Fair Values of Derivative Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Long-term Debt, Fair Value $ 1,485.2 $ 1,510.6
Assets, Fair Value Disclosure, Recurring 5.5 5.6
Fair Value, Inputs, Level 2 [Member]    
Long-term Debt, Fair Value 1,485.2 1,510.6
Assets, Fair Value Disclosure, Recurring 5.5 5.6
Fair Value, Inputs, Level 3 [Member]    
Long-term Debt, Fair Value 0.0 0.0
Assets, Fair Value Disclosure, Recurring 0.0 0.0
Fair Value, Inputs, Level 1 [Member]    
Long-term Debt, Fair Value 0.0 0.0
Assets, Fair Value Disclosure, Recurring 0.0 0.0
Foreign Exchange Contract [Member]    
Derivative instruments, gross asset 0.2 1.0
Derivative instruments, gross liability 0.7 0.3
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member]    
Derivatives not designated as hedges, liability 0.7 0.3
Derivative instruments, gross asset 0.2 1.0
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 3 [Member]    
Derivative instruments, gross asset 0.0 0.0
Derivative instruments, gross liability 0.0 0.0
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member]    
Derivative instruments, gross asset 0.0 0.0
Derivative instruments, gross liability 0.0 0.0
Interest Rate Swap [Member]    
Interest Rate Derivative Liabilities, at Fair Value   0.4
Derivative instruments, gross asset 5.3 4.6
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]    
Interest Rate Derivative Liabilities, at Fair Value   0.4
Derivative instruments, gross asset 5.3 4.6
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]    
Interest Rate Derivative Liabilities, at Fair Value   0.0
Derivative instruments, gross asset 0.0 0.0
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member]    
Interest Rate Derivative Liabilities, at Fair Value   0.0
Derivative instruments, gross asset 0.0 0.0
Other Current Assets [Member] | Designated as Hedging Instrument [Member]    
Derivatives designated as hedges, asset 0.2 0.7
Interest Rate Derivative Assets, at Fair Value 5.3 4.6
Other Current Assets [Member] | Undesignated Hedges [Member]    
Derivatives not designated as hedges, asset 0.0 0.3
Other Current Assets [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure, Recurring 5.5  
Derivative instruments, gross asset   5.6
Other Current Liabilities [Member] | Designated as Hedging Instrument [Member]    
Foreign Currency Cash Flow Hedge Liability at Fair Value 0.3 0.1
Other Current Liabilities [Member] | Undesignated Hedges [Member]    
Derivatives not designated as hedges, liability   0.2
Other Current Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Designated as Hedging Instrument [Member]    
Interest Rate Derivative Liabilities, at Fair Value 0.0 0.4
Other Current Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Derivative instruments, gross liability 0.7 $ 0.7
Other Current Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Undesignated Hedges [Member]    
Derivatives not designated as hedges, liability $ 0.4