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Reconciliation of Net Income (Loss) to Basic and Diluted EPS (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Earnings Per Share [Abstract] |  |
Income from continuing operations | $ 14.9 us-gaap_IncomeLossFromContinuingOperations | $ 7.6 us-gaap_IncomeLossFromContinuingOperations
Loss from discontinued operations and disposal, net of tax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (0.2)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income | $ 14.9 us-gaap_NetIncomeLoss | $ 7.4 us-gaap_NetIncomeLoss
Weighted average shares outstanding - Basic (shares) | 62.7 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 62.8 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of common stock equivalents (shares) | 1.0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 0.9 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average shares outstanding - Diluted (shares) | 63.7 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 63.7 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share: |  |
Earnings from continuing operations (usd per share) | $ 0.24 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.12 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Loss from discontinued operations and disposal, net of tax (usd per share) | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net earnings per share (usd per share) | $ 0.24 us-gaap_EarningsPerShareBasic | $ 0.12 us-gaap_EarningsPerShareBasic
Diluted earnings per share: |  |
Earnings from continuing operations (usd per share) | $ 0.23 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.12 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Loss from discontinued operations and disposal, net of tax (usd per share) | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net earnings per share (usd per share) | $ 0.23 us-gaap_EarningsPerShareDiluted | $ 0.12 us-gaap_EarningsPerShareDiluted

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