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Receivables, Net - Rollforward of Allowance for Doubtful Accounts (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Allowance for doubtful accounts - January 1 $ 12.6us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 12.9us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 12.9us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Charges to income 4.0us-gaap_ProvisionForDoubtfulAccounts 1.8us-gaap_ProvisionForDoubtfulAccounts 1.6us-gaap_ProvisionForDoubtfulAccounts
Write-offs (2.6)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs (1.7)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs (1.6)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Foreign currency and other (0.7)us-gaap_AllowanceForLoanAndLeaseLossesForeignCurrencyTranslation (0.4)us-gaap_AllowanceForLoanAndLeaseLossesForeignCurrencyTranslation 0us-gaap_AllowanceForLoanAndLeaseLossesForeignCurrencyTranslation
Allowance for doubtful accounts - December 31 $ 13.3us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 12.6us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 12.9us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent