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Derivative Instruments (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]          
Net assets associated with foreign currency derivatives $ (16.4)   $ (16.4)   $ (26.3)
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     $ (9.9)    
Not Designated [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Net gains (losses) on derivatives not designated as hedging instruments 4.5 $ 0.9 (9.0) $ 0.3  
Foreign Exchange [Member] | Cash Flow Hedges [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Aggregate cash flow hedges outstanding 359.3   359.3    
Cash flow hedges outstanding for British pounds 164.1   164.1    
Cash flow hedges outstanding for Brazilian reals 92.9   92.9    
Cash flow hedges outstanding for euros 41.7   41.7    
Cash flow hedges outstanding for Singapore dollars 23.6   23.6    
Cash flow hedges outstanding for Australian dollars 21.6   21.6    
Cash flow hedges outstanding for other currencies 15.4   15.4    
Foreign Exchange [Member] | Not Designated [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Aggregate cash flow hedges outstanding 169.5   169.5    
Cash flow hedges outstanding for British pounds 15.4   15.4    
Cash flow hedges outstanding for euros 86.5   86.5    
Cash flow hedges outstanding for Indonesian rupiah 15.1   15.1    
Cash flow hedges outstanding for Mexican Pesos 12.8   12.8    
Cash flow hedges outstanding for Swiss francs 23.2   23.2    
Cash flow hedges outstanding for other currencies $ 16.5   $ 16.5