Earnings (Loss) Per Share (Weighted Average Common and Common Equivalent Shares) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net income from continuing operations	$ 419.8	$ 375.8	$ 317.3
Loss from discontinued operations, net of income taxes	(1.1)	(0.9)	(0.9)
NET INCOME	$ 418.7us-gaap_NetIncomeLoss	$ 374.9us-gaap_NetIncomeLoss	$ 316.4us-gaap_NetIncomeLoss
Weighted average common shares outstanding used in calculating basic EPS (in shares)	117.3	121.3	123.8
Effect of dilutive stock options	1.6	2.0	2.0
Weighted average common shares outstanding used in calculating diluted EPS (in shares)	118.9	123.3	125.8
Basic EPS amounts
Continuing operations (in dollars per share)	$ 3.58	$ 3.10	$ 2.56
Discontinued operations (in dollars per share)	$ (0.01)	$ (0.01)	$ (0.01)
Net income (in dollars per share)	$ 3.57us-gaap_EarningsPerShareBasic	$ 3.09us-gaap_EarningsPerShareBasic	$ 2.56us-gaap_EarningsPerShareBasic
Diluted EPS amounts:
Continuing operations (in dollars per share)	$ 3.53	$ 3.05	$ 2.52
Discontinued operations (in dollars per share)	$ (0.01)	$ (0.01)	$ (0.01)
Net income (in dollars per share)	$ 3.52us-gaap_EarningsPerShareDiluted	$ 3.04us-gaap_EarningsPerShareDiluted	$ 2.52us-gaap_EarningsPerShareDiluted

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

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