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SCHEDULE II - Valuation and Qualifying Accounts
 12 Months Ended
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, 20191.6 1.9 — (1.1)2.4 
Year Ended December 31, 20181.1 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, 20199.4 (0.8)(0.4)— 8.2 
Year Ended December 31, 201810.6 — (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.