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Changes in Each Component of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Amounts reclassified from accumulated other comprehensive income, Pension Benefit Plan Costs | $ (1.9) | [1]
Amounts reclassified from accumulated other comprehensive income, Foreign Currency | (0.3) | [1]
Federal Signal Technologies |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Amounts reclassified from accumulated other comprehensive income, Pension Benefit Plan Costs | 2.0 |
Amounts reclassified from accumulated other comprehensive income, Pension Benefit Plan Costs, tax benefit | 0.1 |
Amounts reclassified from accumulated other comprehensive income, Foreign Currency | $ 0.3 |
[1] | Represents $2.0 million of costs included in net postretirement pension expense, net of income tax benefit of $0.1 million, and $0.3 million of foreign currency effects related to the FSTech disposal included in gain from discontinued operations and disposal.

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