Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Foreign currency forward contracts that were entered into to hedge forecasted revenue
Total foreign currency forward contracts	$ 483.3		$ 524.0
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	12 months		12 months
Gain/Loss on fair value of Foreign currency forward contracts	1.2		11.8
Expected Settlement time for contracts, in months	12 months
Aggregate notional amount of outstanding foreign currency contracts	138.6		243.2
Net gains (losses) of other income (expense) related to foreign currency forward contracts	0.9	4.3
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	5.1		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	1.9		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	2.7		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	0.5		2.9
Euro [Member]
Foreign currency forward contracts that were entered into to hedge forecasted revenue
Total foreign currency forward contracts	456.7		492.2
Canadian Dollar [Member]
Foreign currency forward contracts that were entered into to hedge forecasted revenue
Total foreign currency forward contracts	26.6		31.8
Sales [Member] | Foreign Exchange Contract [Member]
Derivative Instruments (Textual) [Abstract]
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax	1.2	16.0
Gains/(Losses) in product revenue for the settlement of certain effective cash flow hedge instruments	1.1	5.4
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	$ 0.2	$ 1.9