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Share-Based Employee Compensation Plans and Other Compensation and Benefit Plans (Other Share-Based Compensation and Benefit Plans Activity) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Employee Stock Purchase Plan [Member]
Compensation expense for benefit plans	$ 0.4	$ 0.3
Income tax benefit from compensation expense for benefit plans	0.1	0.1
Restricted Stock [Member]
Compensation expense for benefit plans	0.5	0.4
Income tax benefit from compensation expense for benefit plans	$ 0.2	$ 0.2

Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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