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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

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