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Discontinued Operations - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 0 Months Ended |  |
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Sep. 04, 2012 | Jun. 21, 2012 | May 31, 2012 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2010 | Jun. 30, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2011 Federal Signal Technologies | Dec. 31, 2010 Federal Signal Technologies | Dec. 31, 2011 Trade Names Federal Signal Technologies | Dec. 31, 2010 Trade Names Federal Signal Technologies | Sep. 04, 2012 Working Capital Adjustment | Sep. 04, 2012 Cash | Sep. 04, 2012 Escrow | Dec. 31, 2013 Other current assets [Member] | Dec. 31, 2012 Deferred charges and other assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on discontinued operations and disposal |  |  |  | $ (0.4) | $ 0.8 | $ 0.3 | $ (0.5) | $ 0.1 | [1] | $ 19.1 | [2] | $ 26.1 | $ 4.2 | [3] |  |  | $ 0.2 | $ 49.5 | $ 27.3 |  |  |  |  |  |  |  |  |
Severance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.6 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale agreement | 110.0 | 110.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.9 | 82.1 | 22.0 |  |
Assets held for sale carrying value |  | 121.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value less cost to sell |  | 97.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset held for sale fair value |  | 101.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost to sell assets held for sale |  | 3.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  |  |  |  |  |  | 0.6 |  |  |  | 23.5 |  |  |  |  |  |  |  |  |  |  |  |
Escrow receivable |  |  |  |  |  |  |  |  |  | 5.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.8 | 8.0
Increase in carrying value of asset held for sale |  |  |  |  |  |  |  |  |  | 0.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction cost |  |  |  |  |  |  |  |  |  | 0.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total loss on disposal |  |  |  |  |  |  |  |  |  | 12.2 |  |  |  |  |  |  |  | 34.7 |  |  |  |  |  |  |  |  |  |
Escrow identified for general representations and warranties period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18 months |  |  |  |  |  |  |  |  |  |  |
Remaining general escrow fund to be held |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36 months |  |  |  |  |  |  |  |  |  |  |
Subsequent claim by buyer |  |  |  | 0.8 |  |  |  |  |  |  |  |  |  |  |  |  | 0.8 |  |  |  |  |  |  |  |  |  |  |
Escrow release |  |  |  | 7.0 |  |  |  |  |  |  |  |  |  |  |  |  | 7.0 |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.8 | 67.1 |  |  |  |  |  |  |
Impairment charges of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.4 | 11.8 |  |  |  |  |
Goodwill adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.6 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on discontinued operations related to the liquidation of the assets of the China WOFE business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.4 |  |  |  |  |  |  |  |  |  |
Loss from discontinued operations, costs associated with wind down of business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.5 |  |  |  |  |  |  |  |  |
Proceed from sale of Pearland |  |  | 0.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre tax gain |  |  | 0.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation at the Pearland, Texas facility |  |  |  | 1.4 |  |  |  | 1.8 |  |  |  |  |  |  |  |  | 1.4 | 1.8 |  |  |  |  |  |  |  |  |  |
Estimated product liability obligations |  |  |  | $ 3.6 |  |  |  | $ 4.6 |  |  |  |  |  |  |  |  | $ 3.6 | $ 4.6 |  |  |  |  |  |  |  |  |  |
[1] | Income from continuing operations includes $0.6 million of restructuring charges.
[2] | Income from continuing operations includes $1.9 million of debt settlement charges associated with a prior debt refinancing.
[3] | Income from continuing operations includes $1.6 million of debt settlement charges associated with a prior debt refinancing and $0.9 million of restructuring charges.

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- Definition The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228 + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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