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, 2009		$ 36.4	$ 2,587.4	$ 341.0	$ 6,289.5	$ (754.2)
Common Stock Activity		0.1	20.1
Change During Period	96.9			96.9
Net Income	439.5
Dividends to Stockholders (per common share: $0.185; $0.165)					(55.2)
Purchases of Treasury Stock						(129.8)
Retirement of Repurchased Common Shares		0	0		0
Balance at End of Period at Jun. 30, 2010	8,871.7	36.5	2,607.5	437.9	6,673.8	(884.0)
Balance at Beginning of Year at Dec. 31, 2010	8,944.4	36.5	2,615.4	341.9	7,060.8	(1,110.2)
Common Stock Activity		0.1	17.0
Change During Period	94.1			94.1
Net Income	455.2				455.2
Dividends to Stockholders (per common share: $0.185; $0.165)					(58.3)
Purchases of Treasury Stock						(169.7)
Retirement of Repurchased Common Shares		(0.8)	(55.2)		(144.0)
Balance at End of Period at Jun. 30, 2011	$ 9,082.8	$ 35.8	$ 2,577.2	$ 436.0	$ 7,313.7	$ (1,279.9)