XML 76 R41.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Income Tax Disclosure [Abstract] |  |
Income tax expense | $ 4.1 | $ 3.8
Effective tax rate | 24.10% | 34.50%
2017 Tax Act transition tax, rate applied to cash | 15.50% |
2017 Tax Act transition tax, rate applied to earnings in excess of cash | 8.00% |

X
- Definition The tax rate applied to cash and equivalents at controlled foreign corporations for the untaxed post-1986 accumulated earnings and profits taxed under the Tax Cuts and Jobs Act of 2017 ("2017 Tax Act"). + References No definition available. + Details
Name: | fss_TaxActTransitionTaxRateAppliedtoCash
Namespace Prefix: | fss_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The tax rate applied to earnings in excess of cash and equivalents at controlled foreign corporations for the untaxed post-1986 accumulated earnings and profits taxed under the Tax Cuts and Jobs Act of 2017 ("2017 Tax Act"). + References No definition available. + Details
Name: | fss_TaxActTransitionTaxRateAppliedtoEarningsinExcessofCash
Namespace Prefix: | fss_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
Name: | us-gaap_EffectiveIncomeTaxRateContinuingOperations
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_IncomeTaxExpenseBenefit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration