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Share-Based Compensation Plans (Schedule of Compensation Cost and Income Tax Benefit) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award
Compensation cost for stock options, stock appreciation rights, and restricted stock units	$ 36.6	$ 57.6	$ 54.9
Total income tax benefit recognized for share-based arrangements	$ 11.7	$ 18.7	$ 18.5

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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