Earnings Per Share (Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income from continuing operations	$ 119.0	$ 106.7	$ 345.9	$ 302.9
Loss from discontinued operations, net of income taxes	(0.5)	(0.2)	(0.8)	(0.9)
NET INCOME	$ 118.5	$ 106.5	$ 345.1	$ 302.0
Weighted average common shares outstanding used in calculating basic EPS (in shares)	112.4	117.0	113.3	118.5
Effect of dilutive stock options (in shares)	1.2	1.5	1.3	1.7
Weighted average common shares outstanding used in calculating diluted EPS (in shares)	113.6	118.5	114.6	120.2
Basic EPS amounts(1):
Continuing operations (in dollars per share)	$ 1.06	$ 0.91	$ 3.05	$ 2.56
Discontinued operations (in dollars per share)	0.00	0.00	(0.01)	(0.01)
Net income (in dollars per share)	1.05	0.91	3.05	2.55
Diluted EPS amounts(1):
Continuing operations (in dollars per share)	1.05	0.90	3.02	2.52
Discontinued operations (in dollars per share)	0.00	0.00	(0.01)	(0.01)
Net income (in dollars per share)	$ 1.04	$ 0.90	$ 3.01	$ 2.51