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Derivatives and Hedging Activities (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Effect of derivative instruments on condensed consolidated statement of operations
Derivative Instruments, Gain (Loss) Recognized in Income, Net, Total	$ 9.8	$ 1.0
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Effect of derivative instruments on condensed consolidated statement of operations
Derivative Instruments, Gain (Loss) Recognized in Income, Net, Total	4.1	4.5
Designated as Hedging Instrument [Member] \| Foreign Exchange Forward [Member]
Effect of derivative instruments on condensed consolidated statement of operations
Derivative Instruments, Gain (Loss) Recognized in Income, Net, Total	0.4	0.5
Not Designated as Hedging Instrument [Member] \| Foreign Exchange Forward [Member]
Effect of derivative instruments on condensed consolidated statement of operations
Derivative Instruments, Gain (Loss) Recognized in Income, Net, Total	$ 5.3	$ (6.0)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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