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Derivative Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]          
Net assets associated with foreign currency derivatives $ (8.9)   $ (8.9)   $ 6.8
Document Period End Date     Sep. 30, 2018    
Maturity period of derivatives (in months)     18 months    
Estimated amount of net gains (losses) associated with derivative instruments, net of tax, in next twelve months     $ (4.0)    
Designated as Hedging Instrument | Foreign Exchange Forward | Cash Flow Hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, notional amount 187.9   187.9    
Designated as Hedging Instrument | United Kingdom, Pounds | Foreign Exchange Forward | Cash Flow Hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, notional amount 79.0   79.0    
Designated as Hedging Instrument | Australia, Dollars | Foreign Exchange Forward | Cash Flow Hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, notional amount 57.5   57.5    
Designated as Hedging Instrument | Euro Member Countries, Euro | Foreign Exchange Forward | Cash Flow Hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, notional amount 20.7   20.7    
Designated as Hedging Instrument | Brazil, Brazil Real | Foreign Exchange Forward | Cash Flow Hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, notional amount 13.9   13.9    
Designated as Hedging Instrument | Singapore, Dollars | Foreign Exchange Forward | Cash Flow Hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, notional amount 14.0   14.0    
Designated as Hedging Instrument | No currency | Foreign Exchange Forward | Cash Flow Hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, notional amount 2.8   2.8    
Not Designated as Hedging Instrument          
Derivative Instruments, Gain (Loss) [Line Items]          
Net gains (losses) on derivatives not designated as hedging instruments 2.2 $ 2.7 9.7 $ 8.9  
Not Designated as Hedging Instrument | Foreign Exchange Forward | Fair Value Hedging          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, notional amount 153.2   153.2    
Not Designated as Hedging Instrument | United Kingdom, Pounds | Foreign Exchange Forward | Fair Value Hedging          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, notional amount 11.6   11.6    
Not Designated as Hedging Instrument | Thailand, Baht | Foreign Exchange Forward | Fair Value Hedging          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, notional amount 8.6   8.6    
Not Designated as Hedging Instrument | Australia, Dollars | Foreign Exchange Forward | Fair Value Hedging          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, notional amount 18.8   18.8    
Not Designated as Hedging Instrument | Indonesia, Rupiahs | Foreign Exchange Forward | Fair Value Hedging          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, notional amount 11.6   11.6    
Not Designated as Hedging Instrument | Euro Member Countries, Euro | Foreign Exchange Forward | Fair Value Hedging          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, notional amount 89.4   89.4    
Not Designated as Hedging Instrument | No currency | Foreign Exchange Forward | Fair Value Hedging          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, notional amount $ 13.2   $ 13.2