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Pensions - Additional Information (Details) shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number Of Individuals Elected Lump Sum Settlement | 516 |  |
Payments for Repurchase of Common Stock | $ 0 | $ 37,800,000 | $ 10,600,000
Cash dividends paid to stockholders | 16,800,000 | 16,900,000 | 15,600,000
Amortization of actuarial loss | 3,600,000 |  |
Cost of defined contribution pension plans | $ 6,900,000 | $ 6,900,000 | $ 7,500,000
Federal Signal common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company repurchased shares from U.S. benefit plan | shares |  | 0.2 |
U.S. Benefit Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted-average target return of pension plans | 7.10% | 7.50% | 7.80%
Payments for Repurchase of Common Stock |  | $ 3,600,000 |
Cash dividends paid to stockholders |  | $ 100,000 |
Expected contribution to defined benefit plan | $ 5,100,000 |  |
U.S. Benefit Plans | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum target allocation | 53.00% |  |
Maximum target allocation | 73.00% |  |
U.S. Benefit Plans | Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum target allocation | 25.00% |  |
Maximum target allocation | 45.00% |  |
U.S. Benefit Plans | Cash and Cash Equivalents |  |  |
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 | 7.00% |  |
Non-U.S. Benefit Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted-average target return of pension plans | 4.20% | 4.90% | 4.70%
Expected contribution to defined benefit plan | $ 1,400,000 |  |
Non-U.S. Benefit Plan | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum target allocation | 65.00% |  |
Maximum target allocation | 75.00% |  |
Non-U.S. Benefit Plan | Debt Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum target allocation | 25.00% |  |
Maximum target allocation | 35.00% |  |

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- Definition The number eligible, terminated, vested defined benefit plan participants that elected to receive a limited time voluntary lump-sum settlement payment. + References No definition available. + 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 Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + 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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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + 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 (g) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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