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Changes in Company's Warranty Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]    
Beginning Balance $ 8.4us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 6.8us-gaap_ProductWarrantyAccrualClassifiedCurrent
Provisions to expense 8.8fss_ProvisionsToExpense 10.1fss_ProvisionsToExpense
Actual costs incurred (8.1)us-gaap_ProductWarrantyExpense (8.5)us-gaap_ProductWarrantyExpense
Ending Balance $ 9.1us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 8.4us-gaap_ProductWarrantyAccrualClassifiedCurrent