CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) (USD $) In Millions, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Retained Earnings	Treasury Stock
Balance at Beginning of Year at Dec. 31, 2013		$ 36.1	$ 2,634.1	$ 255.0	$ 8,064.0	$ (2,349.3)
Increase (Decrease) in Stockholders' Equity
Common Stock Activity			6.7
Other Comprehensive Income	199.4			199.4
Net Income	225.8				225.8
Dividends to Stockholders (per common share: $0.165; $0.145)					(38.3)
Purchases of Treasury Stock	(100.1)					(100.1)
Balance at End of Period at Mar. 31, 2014	8,933.4	36.1	2,640.8	454.4	8,251.5	(2,449.4)
Balance at Beginning of Year at Dec. 31, 2014	8,521.9	30.2	2,221.2	166.4	7,302.3	(1,198.2)
Increase (Decrease) in Stockholders' Equity
Common Stock Activity			9.5
Other Comprehensive Income	94.0			94.0
Net Income	212.9				212.9
Dividends to Stockholders (per common share: $0.165; $0.145)					(42.3)
Purchases of Treasury Stock	(108.1)					(108.1)
Balance at End of Period at Mar. 31, 2015	$ 8,687.9	$ 30.2	$ 2,230.7	$ 260.4	$ 7,472.9	$ (1,306.3)