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SCHEDULE II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
SCHEDULE II - Valuation and Qualifying Accounts | SCHEDULE II FEDERAL SIGNAL CORPORATION AND SUBSIDIARIES Valuation and Qualifying Accounts For the years ended December 31, 2020, 2019 and 2018
|  |  | Additions |  |  |  |
(in millions) | Balance at Beginning of Year |  | Charged to Costs and Expenses |  | Charged to Other Accounts(a) |  | Deductions(b) |  | Balance at End of Year
Allowance for doubtful accounts: |  |  |  |  |  |  |  |  |
Year Ended December 31, 2020 | $ | 2.4 |  |  | $ | 2.4 |  |  | $ | — |  |  | $ | (1.9) |  |  | $ | 2.9 |
Year Ended December 31, 2019 | 1.6 |  |  | 1.9 |  |  | — |  |  | (1.1) |  |  | 2.4 |
Year Ended December 31, 2018 | 1.1 |  |  | 1.0 |  |  | — |  |  | (0.5) |  |  | 1.6 |
Income tax valuation allowances: |  |  |  |  |  |  |  |  |
Year Ended December 31, 2020 | $ | 8.2 |  |  | $ | 0.1 |  |  | $ | 0.5 |  |  | $ | — |  |  | $ | 8.8 |
Year Ended December 31, 2019 | 9.4 |  |  | (0.8) |  |  | (0.4) |  |  | — |  |  | 8.2 |
Year Ended December 31, 2018 | 10.6 |  |  | — |  |  | (1.2) |  |  | — |  |  | 9.4 |
(a) Represents amounts recognized in Accumulated other comprehensive loss and other adjustments that had no net impact on Income tax expense in the year. (b) Represents amounts written off, net of related recoveries.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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