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Share-Based Payments (Details 10) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Shares issued under employee stock purchase plan
Shares issued under ESPP	0.4	0.6	0.6
Cash received under ESPP	$ 22.8	$ 23.5	$ 22.6

Number of shares issued during the period as a result of an employee stock purchase plan.

Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.