CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Retained Earnings	Treasury Stock
Balance at Beginning of Year at Dec. 31, 2010		$ 36.5	$ 2,615.4	$ 351.4	$ 6,591.8	$ (1,110.2)
Common Stock Activity		0.1	12.2
Retirement of Repurchased Common Shares		(0.8)	(55.2)		(144.0)
All Other Changes During Year	54.9			54.9
Net Income	223.6				223.6
Dividends to Stockholders (per common share: $0.1050; $0.0925)					(29.9)
Purchases of Treasury Stock	(200.0)					(23.6)
Balance at End of Period at Mar. 31, 2011	8,522.2	35.8	2,572.4	406.3	6,641.5	(1,133.8)
Balance at Beginning of Year at Dec. 31, 2011	8,169.7	35.9	2,591.1	461.8	6,611.0	(1,530.1)
Common Stock Activity		0	9.3
Retirement of Repurchased Common Shares		0	0		0
All Other Changes During Year	(6.4)			(6.4)
Net Income	213.9
Dividends to Stockholders (per common share: $0.1050; $0.0925)					(31.4)
Purchases of Treasury Stock	(175.2)					(175.2)
Balance at End of Period at Mar. 31, 2012	$ 8,179.9	$ 35.9	$ 2,600.4	$ 455.4	$ 6,793.5	$ (1,705.3)