CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Treasury Stock
Balance at Beginning of Year at Dec. 31, 2009		$ 36.4	$ 2,587.4	$ 347.5	$ 5,827.9	$ (754.2)
Common Stock Activity		0.1	28.0
Retirement of Repurchased Common Shares		0	0		0
Change During Year	3.9			3.9
Net Income	878.7				878.7
Dividends to Stockholders (per common share: $0.470; $0.395; $0.350)					(114.8)
Purchases of Treasury Stock						(356.0)
Balance at End of Period at Dec. 31, 2010	8,484.9	36.5	2,615.4	351.4	6,591.8	(1,110.2)
Common Stock Activity		0.2	30.9
Retirement of Repurchased Common Shares		(0.8)	(55.2)		(144.0)
Change During Year	110.4			110.4
Net Income	284.2				284.2
Dividends to Stockholders (per common share: $0.470; $0.395; $0.350)					(121.0)
Purchases of Treasury Stock						(419.9)
Balance at End of Period at Dec. 31, 2011	8,169.7	35.9	2,591.1	461.8	6,611.0	(1,530.1)
Common Stock Activity		0.1	16.6
Retirement of Repurchased Common Shares		0	0		0
Change During Year	166.2			166.2
Net Income	894.4				894.4
Dividends to Stockholders (per common share: $0.470; $0.395; $0.350)					(133.8)
Purchases of Treasury Stock						(500.6)
Balance at End of Period at Dec. 31, 2012	$ 8,612.6	$ 36.0	$ 2,607.7	$ 628.0	$ 7,371.6	$ (2,030.7)