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Summary of Pension Assets in Three Tier Fair Value Hierarchy for Benefit Plan (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
U.S. Benefit Plans |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | $ 129.4 | $ 112.2 | $ 97.0
U.S. Benefit Plans | Level 1 |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 125.8 | 106.3 |
U.S. Benefit Plans | Level 1 | Cash and Cash Equivalents |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 2.9 | 3.7 |
U.S. Benefit Plans | Level 1 | US Large Cap Equity Securities |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 37.1 | 32.7 |
U.S. Benefit Plans | Level 1 | US Small / Mid Cap Equity Securities |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 15.3 | 11.9 |
U.S. Benefit Plans | Level 1 | Federal Signal common stock |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 13.6 | 7.1 |
U.S. Benefit Plans | Level 1 | Developed International |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 9.6 | 6.6 |
U.S. Benefit Plans | Level 1 | Equity Securities Emerging Markets |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 2.7 | 4.5 |
U.S. Benefit Plans | Level 1 | US Government Debt Securities | Fixed Income Securities |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 6.8 | 5.7 |
U.S. Benefit Plans | Level 1 | Asset-backed Securities | Fixed Income Securities |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value |  | 0 |
U.S. Benefit Plans | Level 1 | Fixed Income Mutual Funds [Member] |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 18.0 | 12.2 |
U.S. Benefit Plans | Level 1 | Other Investments Mutual Funds [Member] |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 19.8 | 21.9 |
U.S. Benefit Plans | Level 2 |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 3.6 | 5.9 |
U.S. Benefit Plans | Level 2 | Cash and Cash Equivalents |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value |  | 0 |
U.S. Benefit Plans | Level 2 | Developed International |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 0.1 |  |
U.S. Benefit Plans | Level 2 | Asset-backed Securities | Fixed Income Securities |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 3.5 | 5.9 |
U.S. Benefit Plans | Level 3 |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
U.S. Benefit Plans | Total |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 129.4 | 112.2 |
U.S. Benefit Plans | Total | Cash and Cash Equivalents |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 2.9 | 3.7 |
U.S. Benefit Plans | Total | US Large Cap Equity Securities |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 37.1 | 32.7 |
U.S. Benefit Plans | Total | US Small / Mid Cap Equity Securities |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 15.3 | 11.9 |
U.S. Benefit Plans | Total | Federal Signal common stock |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 13.6 | 7.1 |
U.S. Benefit Plans | Total | Developed International |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 9.7 | 6.6 |
U.S. Benefit Plans | Total | Equity Securities Emerging Markets |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 2.7 | 4.5 |
U.S. Benefit Plans | Total | US Government Debt Securities | Fixed Income Securities |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 6.8 | 5.7 |
U.S. Benefit Plans | Total | Asset-backed Securities | Fixed Income Securities |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 3.5 | 5.9 |
U.S. Benefit Plans | Total | Fixed Income Mutual Funds [Member] |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 18.0 | 12.2 |
U.S. Benefit Plans | Total | Other Investments Mutual Funds [Member] |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 19.8 | 21.9 |
Non-U.S. Benefit Plan |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 62.4 | 54.8 | 47.9
Non-U.S. Benefit Plan | Level 1 |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 25.5 | 25.1 |
Non-U.S. Benefit Plan | Level 1 | Cash and Cash Equivalents |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 10.7 | 10.6 |
Non-U.S. Benefit Plan | Level 1 | Equity Securities |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 6.3 | 4.8 |
Non-U.S. Benefit Plan | Level 1 | Government securities |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value |  |  |
Non-U.S. Benefit Plan | Level 1 | US Government Agencies Debt Securities [Member] |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 4.0 | 4.1 |
Non-U.S. Benefit Plan | Level 1 | Company bonds and debt securities |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 4.5 | 5.6 |
Non-U.S. Benefit Plan | Level 2 |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 36.9 | 29.7 |
Non-U.S. Benefit Plan | Level 2 | Equity Securities |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 36.9 | 29.7 |
Non-U.S. Benefit Plan | Level 3 |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
Non-U.S. Benefit Plan | Total |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 62.4 | 54.8 |
Non-U.S. Benefit Plan | Total | Cash and Cash Equivalents |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 10.7 | 10.6 |
Non-U.S. Benefit Plan | Total | Equity Securities |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 43.2 | 34.5 |
Non-U.S. Benefit Plan | Total | Government securities |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value |  |  |
Non-U.S. Benefit Plan | Total | US Government Agencies Debt Securities [Member] |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | 4.0 | 4.1 |
Non-U.S. Benefit Plan | Total | Company bonds and debt securities |  |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |  |
Total assets at fair value | $ 4.5 | $ 5.6 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + 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 (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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