Segment Information - Schedule of Segment Information by Regions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Services revenue
Services revenue	$ 1,782.3	$ 1,553.5	$ 1,177.2
Operating income (loss)
Total operating income	77.5	82.9	66.5
General and administrative expenses
General and administrative expenses	140.4	109.1	88.2
Depreciation and amortization
Depreciation expense and amortization	36.1	29.7	25.1
Lease Type Contracts
Services revenue
Services revenue	293.2	275.7	215.6
Management Type Contracts
Services revenue
Services revenue	590.0	518.7	385.9
Reimbursed Management Type Contract Revenue
Services revenue
Services revenue	899.1	759.1	575.7
Operating Segments | Commercial
Services revenue
Services revenue	585.5	538.5	439.0
Operating income (loss)
Total operating income	135.0	122.0	101.3
General and administrative expenses
General and administrative expenses	36.6	29.3	23.0
Depreciation and amortization
Depreciation expense and amortization	15.1	13.1	13.5
Operating Segments | Commercial | Lease Type Contracts
Services revenue
Services revenue	277.8	261.7	206.5
Operating Segments | Commercial | Management Type Contracts
Services revenue
Services revenue	307.7	276.8	232.5
Operating Segments | Aviation
Services revenue
Services revenue	297.7	255.9	162.5
Operating income (loss)
Total operating income	37.9	33.5	21.8
General and administrative expenses
General and administrative expenses	17.2	12.6	11.8
Depreciation and amortization
Depreciation expense and amortization	12.2	11.2	8.4
Operating Segments | Aviation | Lease Type Contracts
Services revenue
Services revenue	15.4	14.0	9.1
Operating Segments | Aviation | Management Type Contracts
Services revenue
Services revenue	282.3	241.9	153.4
Segment Reconciling Items
Operating income (loss)
Total operating income	(95.4)	(72.6)	(56.6)
General and administrative expenses
General and administrative expenses	86.6	67.2	53.4
Depreciation and amortization
Depreciation expense and amortization	$ 8.8	$ 5.4	$ 3.2