Share-Based Compensation (Share-Based Compensation Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Share Based Compensation Expense	$ 15.7	$ 2.9	$ 36.5	$ 30.6
Tax benefit	(6.0)	(1.1)	(14.0)	(11.7)
After-tax expense	9.7	1.8	22.5	18.9
Stock Options [Member]
Share Based Compensation Expense	4.2	4.4	1.7	17.6
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Expense	5.1	3.9	17.1	16.4
Performance Shares [Member]
Share Based Compensation Expense	6.4	(3.8)	16.3	(2.7)
Deferred Compensation [Member]
Share Based Compensation Expense	(0.4)	0.2	(0.5)	0.6
Other share based compensation [Member]
Share Based Compensation Expense	$ 0.4	$ (1.8)	$ 1.9	$ (1.3)