Earnings Per Share (Computation of Earnings Per Share) (Detail) (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 Basic And Diluted [Line Items]
Income from continuing operations	$ 84.9	$ 98.4	$ 273.9	$ 276.6
Loss from discontinued operations	(0.1)	(2.2)	(1.7)	(2.3)
Net income	84.8	96.2	272.2	274.3
Less: Preferred stock dividends		(0.1)		(0.3)
Income attributable to common stockholders - basic	$ 84.8	$ 96.1	$ 272.2	$ 274.0
Weighted average common shares outstanding - basic	162.5	158.6	161.6	157.9
Dilutive effect of conversion of convertible preferred stock		1.2		1.2
Dilutive effect of exercise of stock-based awards	1.3	1.6	1.3	1.5
Weighted average common shares outstanding - diluted	163.8	161.4	162.9	160.6
Continuing operations	$ 0.52	$ 0.62	$ 1.69	$ 1.75
Discontinued operations		$ (0.01)	$ (0.01)	$ (0.01)
Net income	$ 0.52	$ 0.61	$ 1.68	$ 1.74
Continuing operations	$ 0.52	$ 0.61	$ 1.68	$ 1.72
Discontinued operations		$ (0.01)	$ (0.01)	$ (0.01)
Net income	$ 0.52	$ 0.60	$ 1.67	$ 1.71
Antidilutive shares excluded from weighted average number of common shares outstanding for diluted EPS	1.8	4.2	2.3	5.2

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.