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Share-Based Employee Compensation Plans and Other Compensation and Benefit Plans (Stock Option Activity) (Details) (Stock Option [Member], USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Stock Option [Member]
Compensation expense for benefit plans	$ 4.4	$ 4.4
Income tax benefit from compensation expense for benefit plans	$ 1.7	$ 1.7
Weighted-average grant date fair value of options awarded	$ 24.30	$ 16.84

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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