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Computation of Earnings (Loss) Per Common Share (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]                      
Income from continuing operations $ 23.2us-gaap_IncomeLossFromContinuingOperations [1] $ 15.2us-gaap_IncomeLossFromContinuingOperations $ 17.0us-gaap_IncomeLossFromContinuingOperations $ 7.6us-gaap_IncomeLossFromContinuingOperations $ 26.7us-gaap_IncomeLossFromContinuingOperations $ 16.8us-gaap_IncomeLossFromContinuingOperations $ 117.8us-gaap_IncomeLossFromContinuingOperations [2] $ (1.1)us-gaap_IncomeLossFromContinuingOperations [3] $ 63.0us-gaap_IncomeLossFromContinuingOperations $ 160.2us-gaap_IncomeLossFromContinuingOperations $ 22.0us-gaap_IncomeLossFromContinuingOperations
Income (Loss) from discontinued operations and disposal 0.6us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 0.2us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 0.1us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (0.2)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 0.4us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity [4] (0.8)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (0.3)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 0.5us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 0.7us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (0.2)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (49.5)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income (loss) $ 23.8us-gaap_NetIncomeLoss $ 15.4us-gaap_NetIncomeLoss $ 17.1us-gaap_NetIncomeLoss $ 7.4us-gaap_NetIncomeLoss $ 27.1us-gaap_NetIncomeLoss $ 16.0us-gaap_NetIncomeLoss $ 117.5us-gaap_NetIncomeLoss $ (0.6)us-gaap_NetIncomeLoss $ 63.7us-gaap_NetIncomeLoss $ 160.0us-gaap_NetIncomeLoss $ (27.5)us-gaap_NetIncomeLoss
Weighted average shares outstanding - basic (shares)                 62.7us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 62.6us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 62.3us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of common stock equivalents (shares)                 0.9us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 0.6us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 0.4us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average shares outstanding - Diluted (shares)                 63.6us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 63.2us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 62.7us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings (loss) per share:                      
Earnings from continuing operations (usd per share)                 $ 1.00us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 2.56us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.35us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Loss from discontinued operations and disposal, net of tax (usd per share)                 $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ (0.79)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net earnings (loss) per share (usd per share)                 $ 1.01us-gaap_EarningsPerShareBasic $ 2.56us-gaap_EarningsPerShareBasic $ (0.44)us-gaap_EarningsPerShareBasic
Diluted earnings (loss) per share:                      
Earnings from continuing operations (usd per share) $ 0.36us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.24us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.27us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.12us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.42us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.26us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.87us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (0.02)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.99us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 2.53us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.35us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Loss from discontinued operations and disposal, net of tax (usd per share) $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ (0.79)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net earnings (loss) per share (usd per share) $ 0.37us-gaap_EarningsPerShareDiluted $ 0.24us-gaap_EarningsPerShareDiluted $ 0.27us-gaap_EarningsPerShareDiluted $ 0.12us-gaap_EarningsPerShareDiluted $ 0.42us-gaap_EarningsPerShareDiluted $ 0.25us-gaap_EarningsPerShareDiluted $ 1.87us-gaap_EarningsPerShareDiluted $ (0.01)us-gaap_EarningsPerShareDiluted $ 1.00us-gaap_EarningsPerShareDiluted $ 2.53us-gaap_EarningsPerShareDiluted $ (0.44)us-gaap_EarningsPerShareDiluted
[1] Income from continuing operations includes a tax benefit of $3.5 million relating to the release of valuation allowance previously recorded against the Company’s foreign deferred tax assets.
[2] Income from continuing operations includes $102.4 million of valuation allowance release and income of $0.6 million associated with restructuring activity.
[3] (Loss) from continuing operations includes $8.7 million of debt settlement charges associated with the Company's debt refinancing in March 2013.
[4] Income from continuing operations includes a tax benefit of $6.7 million associated with the release of valuation allowance previously recorded against the Company’s foreign tax credits, which would have begun to expire in 2015, following the completion of a tax planning strategy, as well as $1.2 million of restructuring charges.