For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Summary Of Significant Accounting Principles And Policies [Line Items]
Percentage of driver billed allowance for doubtful accounts of CS segment allowance	91.00%	85.00%	91.00%	85.00%
Revenue, remaining performance obligation, amount	$ 187.0		$ 187.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-10-01
Summary Of Significant Accounting Principles And Policies [Line Items]
Revenue, remaining performance obligation, amount	$ 81.9		$ 81.9
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months		12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-10-01
Summary Of Significant Accounting Principles And Policies [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Parking Solutions
Summary Of Significant Accounting Principles And Policies [Line Items]
Contract with customer, liability	$ 22.4		$ 22.4		$ 20.1
Contract with customer, revenue recognized	2.7	$ 1.1	18.3	$ 18.9
Government Solutions
Summary Of Significant Accounting Principles And Policies [Line Items]
Contract with customer, liability	9.3		9.3		$ 8.9
Contract with customer, revenue recognized	$ 0.7	$ 0.9	$ 5.4	$ 6.5
Customer concentration risk \| Sales revenue net \| City of new york department of transportation
Summary Of Significant Accounting Principles And Policies [Line Items]
Concentration risk percentage	24.10%	19.50%	20.60%	16.70%
Unbilled revenue	$ 55.6		$ 55.6
Customer concentration risk \| Sales revenue net \| Commercial services customer A
Summary Of Significant Accounting Principles And Policies [Line Items]
Concentration risk percentage		16.20%		15.60%
Customer concentration risk \| Sales revenue net \| Commercial services customer B
Summary Of Significant Accounting Principles And Policies [Line Items]
Concentration risk percentage	13.90%	11.40%	12.90%	11.50%
Customer concentration risk \| Sales revenue net \| Commercial services customer C
Summary Of Significant Accounting Principles And Policies [Line Items]
Concentration risk percentage		10.40%	10.00%	10.60%
Customer concentration risk \| Accounts receivable \| City of new york department of transportation
Summary Of Significant Accounting Principles And Policies [Line Items]
Concentration risk percentage			11.20%		31.10%