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Pensions - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions to certain multiemployer pension plans | $ 0.1 | $ 0.2 | $ 0.2
Purchases of common stock | 37.8 | 10.6 | 10.3
Amortization of actuarial loss | 3.2 |  |
Cost of defined contribution pension plans | 6.9 | 7.5 | 7.1
Cash dividends paid to stockholders | $ 16.9 | 15.6 | $ 5.6
Defined Benefit Postretirement Health Coverage |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Eligible age for pension plan benefits | 60 years |  |
Minimum service period to be eligible for pension plan benefits | 15 years |  |
Accumulated postretirement benefit liabilities | $ 0.4 | $ 0.5 |
Federal Signal common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Equity securities, common stock (shares) |  | 0.2 |
U.S. Benefit Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted-average target return of pension plans | 7.50% | 7.80% | 7.60%
Purchases of common stock |  | $ 3.6 |
Funded status | $ 49.5 | 46.2 |
Expected contribution to defined benefit plan | 5.0 |  |
Accumulated postretirement benefit liabilities | $ 180.6 | 173.5 |
Cash dividends paid to stockholders |  | $ 0.1 |
U.S. Benefit Plans | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum target allocation | 45.00% |  |
Maximum target allocation | 75.00% |  |
U.S. Benefit Plans | Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum target allocation | 15.00% |  |
Maximum target allocation | 40.00% |  |
U.S. Benefit Plans | Other Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum target allocation | 0.00% |  |
Maximum target allocation | 20.00% |  |
U.S. Benefit Plans | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted-average target return of pension plans | 7.10% |  |
Non-U.S. Benefit Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted-average target return of pension plans | 4.90% | 4.70% | 5.90%
Funded status | $ 3.2 | $ 1.4 |
Expected contribution to defined benefit plan | 1.3 |  |
Accumulated postretirement benefit liabilities | $ 51.7 | $ 55.7 |
Non-U.S. Benefit Plan | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum target allocation | 70.00% |  |
Maximum target allocation | 80.00% |  |
Non-U.S. Benefit Plan | Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum target allocation | 20.00% |  |
Maximum target allocation | 30.00% |  |

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- Definition Minimum Service Period Of Employees To Avail Benefit Under Defined Contribution Benefit Plan + References No definition available. + Details
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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details
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- Definition Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 + Details
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