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Income Tax (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax [Abstract]
Percentage of stock option expense derived from incentive stock options	35.00%
Income taxes, net of refunds	$ 13.4	$ 15.8	$ 18.1

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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