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Derivative Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivatives, Fair Value [Line Items]
Notional amount of foreign currency exchange contract	$ 18.5	$ 22.0	$ 18.5	$ 22.0
Foreign Exchange [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) recognized during the period	$ (0.9)	$ 1.1	$ (0.3)	$ 1.2

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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