Earnings (Loss) Per Share (Weighted Average Common and Common Equivalent Shares) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income from continuing operations	$ 435.0	$ 431.7	$ 443.7
Loss from discontinued operations, net of income taxes	(0.4)	(1.2)	(1.1)
NET INCOME	$ 434.6	$ 430.5	$ 442.6
Weighted average common shares outstanding used in calculating basic EPS (in shares)	97.8	103.1	112.7
Effect of dilutive stock options (in shares)	0.4	0.7	1.2
Weighted average common shares outstanding used in calculating diluted EPS (in shares)	98.2	103.8	113.9
Basic EPS amounts
Continuing operations (in dollars per share)	$ 4.45	$ 4.19	$ 3.94
Discontinued operations (in dollars per share)	0.00	(0.01)	(0.01)
Net income (in dollars per share)	4.44	4.18	3.93
Diluted EPS amounts:
Continuing operations (in dollars per share)	4.43	4.16	3.90
Discontinued operations (in dollars per share)	0.00	(0.01)	(0.01)
Net income (in dollars per share)	$ 4.43	$ 4.15	$ 3.89