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Share-Based Compensation (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share based compensation expense
Total expense, pre-tax	$ 60.5	$ 62.0	$ 75.3
Tax benefit related to awards	(17.8)	(16.2)	(20.9)
Total expense, net of tax	42.7	45.8	54.4
Employee Stock Option [Member]
Share based compensation expense
Total expense, pre-tax	41.7	47.6	61.9
Restricted Stock Units and Other [Member]
Share based compensation expense
Total expense, pre-tax	$ 18.8	$ 14.4	$ 13.4

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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