Consolidated Statements Of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Net sales	$ 918.5us-gaap_SalesRevenueNet	$ 851.3us-gaap_SalesRevenueNet	$ 803.2us-gaap_SalesRevenueNet
Cost of sales	685.2us-gaap_CostOfGoodsAndServicesSold	646.2us-gaap_CostOfGoodsAndServicesSold	613.4us-gaap_CostOfGoodsAndServicesSold
Gross profit	233.3us-gaap_GrossProfit	205.1us-gaap_GrossProfit	189.8us-gaap_GrossProfit
Selling, engineering, general and administrative expenses	140.7	133.8	136.9
Restructuring	0us-gaap_RestructuringCharges	0.7us-gaap_RestructuringCharges	1.4us-gaap_RestructuringCharges
Operating income	92.6us-gaap_OperatingIncomeLoss	70.6us-gaap_OperatingIncomeLoss	51.5us-gaap_OperatingIncomeLoss
Interest expense	3.8us-gaap_InterestExpense	8.8us-gaap_InterestExpense	21.4us-gaap_InterestExpense
Debt settlement charges	0fss_DebtSettlementCosts	8.7fss_DebtSettlementCosts	3.5fss_DebtSettlementCosts
Other expense, net	1.5us-gaap_OtherNonoperatingIncomeExpense	0.1us-gaap_OtherNonoperatingIncomeExpense	0.7us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	87.3	53.0	25.9
Income tax (expense) benefit	(24.3)us-gaap_IncomeTaxExpenseBenefit	107.2us-gaap_IncomeTaxExpenseBenefit	(3.9)us-gaap_IncomeTaxExpenseBenefit
Income from continuing operations	63.0	160.2	22.0
Gain (loss) from discontinued operations and disposal, net of income tax (expense) benefit of $(0.3), $0.8 and $3.6, respectively	0.7	(0.2)	(49.5)
Net income (loss)	$ 63.7us-gaap_NetIncomeLoss	$ 160.0us-gaap_NetIncomeLoss	$ (27.5)us-gaap_NetIncomeLoss
Basic earnings (loss) per share:
Earnings from continuing operations (usd per share)	$ 1.00	$ 2.56	$ 0.35
Loss from discontinued operations and disposal, net of tax (usd per share)	$ 0.01	$ 0.00	$ (0.79)
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)	$ 0.99	$ 2.53	$ 0.35
Loss from discontinued operations and disposal, net of tax (usd per share)	$ 0.01	$ 0.00	$ (0.79)
Net earnings (loss) per share (usd per share)	$ 1.00us-gaap_EarningsPerShareDiluted	$ 2.53us-gaap_EarningsPerShareDiluted	$ (0.44)us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding:
Basic (shares)	62.7	62.6	62.3
Diluted (shares)	63.6	63.2	62.7
Cash dividends declared per common share (usd per share)	$ 0.09	$ 0.00	$ 0.00

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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