Share-Based Compensation (Share-Based Compensation Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Share based compensation expense	$ 26.3	$ 23.0
Tax benefit	(10.1)	(8.8)
After-tax expense	16.2	14.2
Stock Options [Member]
Share based compensation expense	6.5	7.9
Restricted Stock Units (RSUs) [Member]
Share based compensation expense	10.2	(10.1)
Performance Shares [Member]
Share based compensation expense	9.6	3.9
Deferred Compensation [Member]
Share based compensation expense	0.4	(0.4)
Other share based compensation [Member]
Share based compensation expense	0.4	(0.7)
Segment, Continuing Operations [Member]
After-tax expense	16.2	13.1
Discontinued Operations [Member]
After-tax expense	$ 0	$ 1.1