CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - 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, 2014		$ 30.2	$ 2,221.2	$ 166.4	$ 7,302.3	$ (1,198.2)
Increase (Decrease) in Stockholders' Equity
Common Stock Activity			14.3
Other Comprehensive Income (Loss)	$ (163.0)			(163.0)
Net Income	437.2				437.2
Dividends to Stockholders (per common share: $0.385; $0.330)					(83.5)
Purchases of Treasury Stock	(211.2)					(211.2)
Balance at End of Period at Jun. 30, 2015	8,515.7	30.2	2,235.5	3.4	7,656.0	(1,409.4)
Balance at Beginning of Year at Dec. 31, 2015	8,663.9	30.3	2,247.2	16.1	7,995.2	(1,624.9)
Increase (Decrease) in Stockholders' Equity
Common Stock Activity			11.5
Other Comprehensive Income (Loss)	323.7			323.7
Net Income	447.4				447.4
Dividends to Stockholders (per common share: $0.385; $0.330)					(89.4)
Purchases of Treasury Stock	(200.1)					(200.1)
Balance at End of Period at Jun. 30, 2016	$ 9,157.0	$ 30.3	$ 2,258.7	$ 339.8	$ 8,353.2	$ (1,825.0)