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Debt - Summary of Carrying Amount and Fair Value of Financial Instruments (Detail) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2015
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Dec. 31, 2014
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| Carrying Amounts and Fair Values of Financial Instruments [Line Items] | ||||||
| Short-term borrowings | $ 2.8 | $ 0 | ||||
| fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent | 50.1 | 50.2 | ||||
| Long term debt and capital lease obligations | 6.2 | 6.2 | ||||
| Short-term Debt [Member] | ||||||
| Carrying Amounts and Fair Values of Financial Instruments [Line Items] | ||||||
| Short-term borrowings | 2.8 | 0 | ||||
| Short-term Debt, Fair Value | 2.8 | 0 | ||||
| Long-term Debt | ||||||
| Carrying Amounts and Fair Values of Financial Instruments [Line Items] | ||||||
| fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent | 50.1 | [1] | 50.2 | [1] | ||
| Long-term Debt, Fair Value | $ 50.1 | [1] | $ 50.2 | [1] | ||
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