Earnings Per Share (Basic and Diluted EPS) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Net income from continuing operations	$ 92.8	$ 81.9	$ 266.1	$ 234.4
Loss from discontinued operations, net of income taxes	(0.2)	(0.3)	(0.6)	(1.2)
NET INCOME	$ 92.6	$ 81.6	$ 265.5	$ 233.2
Weighted average common shares outstanding used in calculating basic earnings per share	121.5	121.2	121.3	124.4
Effect of dilutive stock options	2.0	2.2	2.0	2.0
Weighted average common shares used in calculating diluted EPS	123.5	123.4	123.3	126.4
Basic EPS amounts:
Continuing operations	$ 0.76	$ 0.68	$ 2.19	$ 1.88
Discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ (0.01)
Net income	$ 0.76	$ 0.67	$ 2.19	$ 1.87
Diluted EPS amounts:
Continuing operations	$ 0.75	$ 0.66	$ 2.16	$ 1.85
Discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ (0.01)
Net income	$ 0.75	$ 0.66	$ 2.15	$ 1.84