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Other Income, net - Details of Other Income, Net (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Other Income And Expenses [Abstract]    
Interest and dividend income $ 3.2us-gaap_InvestmentIncomeInterestAndDividend $ 3.6us-gaap_InvestmentIncomeInterestAndDividend
Net foreign exchange transaction losses (0.5)us-gaap_ForeignCurrencyTransactionLossBeforeTax (2.0)us-gaap_ForeignCurrencyTransactionLossBeforeTax
Bank fee expense (1.1)see_BankFeeExpense (1.6)see_BankFeeExpense
Net gain (loss) on disposals of property and equipment and other 3.3us-gaap_GainLossOnDispositionOfAssets1 (0.1)us-gaap_GainLossOnDispositionOfAssets1
Other, net 0.5us-gaap_OtherNonoperatingIncomeExpense 0.1us-gaap_OtherNonoperatingIncomeExpense
Other income, net $ 5.4us-gaap_NonoperatingIncomeExpense