Share-Based Compensation (Share-Based Compensation Expense) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Share Based Compensation Expense	$ 2.9	$ 12.4	$ 30.6	$ 47.6
Tax benefit	(1.1)	(4.7)	(11.7)	(18.2)
After-tax expense	1.8	7.7	18.9	29.4
Stock Options [Member]
Share Based Compensation Expense	4.4	5.6	17.6	25.6
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Expense	3.9	2.8	16.4	11.0
Performance Shares [Member]
Share Based Compensation Expense	(3.8)	3.6	(2.7)	9.2
Deferred Compensation [Member]
Share Based Compensation Expense	0.2	0.3	0.6	1.0
Stock Appreciation Rights (SARs) [Member]
Share Based Compensation Expense	$ (1.8)	$ 0.1	$ (1.3)	$ 0.8