Earnings Per Share - Schedule of Earnings Per Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Basic earnings per share
Net income from continuing operations	$ 63.8	$ 48.4
Amount allocated to nonvested participating shareholders	(0.2)	(0.2)
Income before discontinued operations available to common shareholders - Basic	63.6	48.2
Income (Loss) from discontinued operations, net	(5.8)	1.7
Amount allocated to nonvested participating shareholders	0	0
Income (Loss) from discontinued operations available to common shareholders - Basic	(5.8)	1.7
Net income	58.0us-gaap_NetIncomeLoss	50.1us-gaap_NetIncomeLoss
Amount allocated to nonvested participating shareholders	(0.2)	(0.2)
Net income available to common shareholders - Basic	57.8	49.9
Average common shares outstanding - Basic	232.8	215.2
Earnings per share from continuing operations - Basic	$ 0.27	$ 0.22
Earnings per share from discontinued operations - Basic	$ (0.02)	$ 0.01
Earnings per share - Basic	$ 0.25us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic
Diluted earnings per share
Net income from continuing operations	63.8	48.4
Amount allocated to nonvested participating shareholders	(0.2)	(0.2)
Income before discontinued operations available to common shareholders - Diluted	63.6	48.2
Income (Loss) from discontinued operations, net	(5.8)	1.7
Amount allocated to nonvested participating shareholders	0	0
Income (Loss) from discontinued operations available to common shareholders - Diluted	(5.8)	1.7
Net income	58.0us-gaap_NetIncomeLoss	50.1us-gaap_NetIncomeLoss
Amount allocated to nonvested participating shareholders	(0.2)	(0.2)
Net income available to common shareholders - Diluted	$ 57.8	$ 49.9
Average common shares outstanding - Basic	232.8	215.2
Assumed conversion of stock options, unvested restricted stock and contingent performance shares, net	0.7	0.5
Average common shares outstanding - Diluted	233.5	215.7
Earnings per share from continuing operations available to common shareholders - Diluted	$ 0.27	$ 0.22
Earnings per share from discontinued operations available to common shareholders - Diluted	$ (0.02)	$ 0.01
Earnings per share - Diluted	$ 0.25us-gaap_EarningsPerShareDiluted	$ 0.23us-gaap_EarningsPerShareDiluted
Anti-dilutive shares	0.1	0

Income before discontinued operations available to common shareholders basic.

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Income loss from discontinued operations attributable to common stockholders for diluted earnings.

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Income loss from discontinued operations available basic common shareholders attributable to reporting entity.

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Undistributed earnings allocated to participating securities continuing operations.

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Undistributed earnings allocated to participating securities discontinued operations.

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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.

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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 a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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