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, 2011		$ 35.9	$ 2,591.1	$ 461.8	$ 6,611.0	$ (1,530.1)
Common Stock Activity		0.1	9.0
Other Comprehensive Income (Loss)	138.7			138.7
Net Income	430.3				430.3
Dividends to Stockholders (per common share: $0.26; $0.21)					(61.6)
Purchases of Treasury Stock	(300.3)					(300.3)
Balance at End of Period at Jun. 30, 2012	8,385.9	36.0	2,600.1	600.5	6,979.7	(1,830.4)
Balance at Beginning of Year at Mar. 31, 2012
Other Comprehensive Income (Loss)	145.1
Net Income	216.4				216.4
Purchases of Treasury Stock	(125.1)
Balance at End of Period at Jun. 30, 2012	8,385.9				6,979.7
Balance at Beginning of Year at Dec. 31, 2012	8,612.6	36.0	2,607.7	628.0	7,371.6	(2,030.7)
Common Stock Activity		0	12.0
Other Comprehensive Income (Loss)	(411.3)			(411.3)
Net Income	431.2				431.2
Dividends to Stockholders (per common share: $0.26; $0.21)					(70.4)
Purchases of Treasury Stock	(193.5)					(193.5)
Balance at End of Period at Jun. 30, 2013	8,380.6	36.0	2,619.7	216.7	7,732.4	(2,224.2)
Balance at Beginning of Year at Mar. 31, 2013
Other Comprehensive Income (Loss)	(269.0)
Net Income	218.6				218.6
Purchases of Treasury Stock	(98.4)
Balance at End of Period at Jun. 30, 2013	$ 8,380.6				$ 7,732.4