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Derivative Financial Instruments - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Interest Rate Swap Agreements
         
Derivative [Line Items]          
Number of derivative contracts 2   2    
Fixed interest rate (as a percent) 0.754% 0.959% 0.754% 0.959%  
Interest Rate Swap Agreements | U.S. dollars
         
Derivative [Line Items]          
Variable Rate Basis     LIBOR    
Foreign Currency Forward Exchange Contracts
         
Derivative [Line Items]          
Number of credit contingency features 0        
Foreign currency unrealized gains expected to be reclassified into earnings over next twelve months, tax $ 1.0   $ 1.0    
Foreign Currency Forward Exchange Contracts | Cash Flow Hedging
         
Derivative [Line Items]          
Gains (losses) in other comprehensive income, effective portion 10.8 9.1 9.0 4.1  
Designated as Hedging Instrument | Interest Rate Swap Agreements
         
Derivative [Line Items]          
Floating rate obligation 75   75    
Notional amount 150.0   150.0    
Carrying value / fair value of derivative liabilities included in other liabilities 0.3   0.3    
Carrying value / fair value of derivative assets included in other assets 0.2   0.2    
Designated as Hedging Instrument | Swaps maturing March 2016
         
Derivative [Line Items]          
Notional amount 50.0   50.0    
Designated as Hedging Instrument | Swaps maturing September 2016
         
Derivative [Line Items]          
Notional amount 50.0   50.0    
Designated as Hedging Instrument | Swaps maturing March 2017
         
Derivative [Line Items]          
Notional amount 50.0   50.0    
Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts
         
Derivative [Line Items]          
Notional amount 192.2   192.2   187.1
Carrying value / fair value of derivative liabilities included in other liabilities 5.2   5.2   0.6
Carrying value / fair value of derivative assets included in other assets 1.7   1.7   11.5
Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts | Cash Flow Hedging
         
Derivative [Line Items]          
Recorded in gross margin 1.6 (0.2) 5.0 (0.9)  
Not Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts
         
Derivative [Line Items]          
Carrying value / fair value of derivative liabilities included in other liabilities 5.9   5.9   0.1
Carrying value / fair value of derivative assets included in other assets 0.3   0.3   2.6
Net gains (losses) on derivative contracts not designated as hedges $ (0.1) $ 6.8 $ (0.3) $ 4.3