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Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Derivative Instruments (Textual) [Abstract]          
Lower Range of Durations of foreign currency forward contracts     1 month   1 month
Higher Range of Durations of foreign currency forward contracts     14 months   12 months
Gain/Loss on fair value of Foreign currency forward contracts $ 1.0   $ 1.0   $ 11.8
Expected Settlement time for contracts, in months     14 months    
Net gains (losses) of other income (expense) related to foreign currency forward contracts 0.6 15.9 1.5 11.4  
Designated as Hedging Instrument [Member]
         
Derivative Instruments (Textual) [Abstract]          
Aggregate notional amount 570.6   570.6   524.0
Not Designated as Hedging Instrument [Member]
         
Derivative Instruments (Textual) [Abstract]          
Aggregate notional amount 188.6   188.6   243.2
Foreign Exchange Contract [Member] | Other Current Assets [Member] | Designated as Hedging Instrument [Member]
         
Summary of Derivatives designated as Hedging Instruments          
Derivative Asset, Fair Value, Net 5.3   5.3   0.6
Foreign Exchange Contract [Member] | Other Current Assets [Member] | Not Designated as Hedging Instrument [Member]
         
Summary of Derivatives designated as Hedging Instruments          
Derivative Asset, Fair Value, Net 0.6   0.6   1.2
Foreign Exchange Contract [Member] | Accrued Liabilities [Member] | Designated as Hedging Instrument [Member]
         
Summary of Derivatives designated as Hedging Instruments          
Derivative Liability, Fair Value, Net 5.1   5.1   11.5
Foreign Exchange Contract [Member] | Accrued Liabilities [Member] | Not Designated as Hedging Instrument [Member]
         
Summary of Derivatives designated as Hedging Instruments          
Derivative Liability, Fair Value, Net 0.8   0.8   2.9
Euro [Member] | Designated as Hedging Instrument [Member]
         
Derivative Instruments (Textual) [Abstract]          
Aggregate notional amount 551.0   551.0   492.2
Canadian Dollar [Member] | Designated as Hedging Instrument [Member]
         
Derivative Instruments (Textual) [Abstract]          
Aggregate notional amount 19.6   19.6   31.8
Sales [Member] | Foreign Exchange Contract [Member]
         
Derivative Instruments (Textual) [Abstract]          
Gains/(Losses) in product revenue for the settlement of certain effective cash flow hedge instruments 0.1 13.6 1.2 19.0  
Other Income Expense [Member] | Foreign Exchange Contract [Member]
         
Derivative Instruments (Textual) [Abstract]          
Gains and losses in earnings of Foreign currency forward contracts due to hedge ineffectiveness $ 0.1 $ 1.3 $ 0.3 $ 3.2