Share-Based Compensation (Share-Based Compensation Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share based compensation expense	$ 15.5	$ 15.7	$ 58.1	$ 36.5
Tax benefit	(5.9)	(6.0)	(22.2)	(14.0)
After-tax expense	9.6	9.7	35.9	22.5
Stock Options [Member]
Share based compensation expense	4.3	4.2	17.5	1.7
Restricted Stock Units (RSUs) [Member]
Share based compensation expense	5.5	5.1	21.9	17.1
Performance Shares [Member]
Share based compensation expense	4.5	6.4	15.8	16.3
Deferred Compensation [Member]
Share based compensation expense	0.3	(0.4)	1.2	(0.5)
Other share based compensation [Member]
Share based compensation expense	$ 0.9	$ 0.4	$ 1.7	$ 1.9