Derivative Instruments and Hedging Activity (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Net Investment Hedging [Member] \| Debt [Member]
Derivatives, Fair Value [Line Items]
Carrying value of foreign denominated debt	$ 101.8	$ 101.8	$ 98.9
Impact of foreign exchange rates on debt instruments recorded in Other Comprehensive Income	(5.4)	(2.0)
Foreign Exchange Forward [Member] \| Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative fair value	$ 17.8	$ 17.8	$ 27.9

- Definition

Before tax and net of reclassification adjustments of the change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity. Also includes the following: gain (loss) on foreign currency forward exchange contracts; foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; and gain (loss) on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain (loss) that has been designated and qualified as a hedging instrument for hedging of the foreign currency exposure of a net investment in a foreign operation.

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