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Share-Based Compensation (Share-Based Compensation Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Share Based Compensation Expense	$ 8.6	$ 15.7
Tax benefit	(3.3)	(6.0)
After-tax expense	5.3	9.7
Stock Options [Member]
Share Based Compensation Expense	(6.7)	8.2
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Expense	8.0	2.8
Performance Shares [Member]
Share Based Compensation Expense	5.6	4.1
Deferred Compensation [Member]
Share Based Compensation Expense	0.4	0
Other share based compensation [Member]
Share Based Compensation Expense	$ 1.3	$ 0.6

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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