Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary of Income from continuing operations before income taxes on basis of segment reporting
Domestic	$ 886.7	$ 592.0	$ 552.2
Foreign	277.8	212.9	231.9
Income from continuing operations before income taxes	1,164.5	804.9	784.1
Current
Federal	192.0	67.4	43.9
Foreign	53.6	36.5	18.4
State	5.2	(38.4)	6.8
Current income tax expense (benefit), total	250.8	65.5	69.1
Deferred
Federal	85.7	148.6	128.9
Foreign	11.3	(2.3)	7.4
State	(1.8)	8.7	2.4
Deferred income tax expense (benefit), total	95.2	155.0	138.7
TOTAL	$ 346.0	$ 220.5	$ 207.8