Segment Information - Schedule of Segment Information by Regions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Services revenue
Services revenue	$ 1,553.5	$ 1,177.2	$ 1,086.9
Cost of services (exclusive of depreciation and amortization)	1,331.8	997.4	1,056.5
General and administrative expenses
General and administrative expenses	109.1	88.2	85.4
Depreciation and amortization
Depreciation expense and amortization	29.7	25.1	29.3
Impairment of goodwill and intangible assets
Impairment of goodwill and intangible assets	0.0	0.0	135.3
Operating income (loss)
Total operating income (loss)	82.9	66.5	(219.6)
Lease Type Contracts
Services revenue
Services revenue	275.7	215.6	189.4
Cost of services (exclusive of depreciation and amortization)	225.8	170.6	195.0
Management Type Contracts
Services revenue
Services revenue	518.7	385.9	359.6
Cost of services (exclusive of depreciation and amortization)	343.2	247.5	226.5
Reimbursed Management Type Contract Revenue
Services revenue
Services revenue	759.1	575.7	537.9
Cost of services (exclusive of depreciation and amortization)	759.1	575.7	537.9
Lease Impairment
Services revenue
Cost of services (exclusive of depreciation and amortization)	3.7	3.6	97.1
Operating Segments | Commercial
Services revenue
Services revenue	538.5	439.0	398.9
General and administrative expenses
General and administrative expenses	29.3	23.0	18.6
Depreciation and amortization
Depreciation expense and amortization	13.1	13.5	13.5
Operating income (loss)
Total operating income (loss)	122.0	101.3	(46.8)
Operating Segments | Commercial | Lease Type Contracts
Services revenue
Services revenue	261.7	206.5	180.8
Operating Segments | Commercial | Management Type Contracts
Services revenue
Services revenue	276.8	232.5	218.1
Operating Segments | Aviation
Services revenue
Services revenue	255.9	162.5	150.1
General and administrative expenses
General and administrative expenses	12.6	11.8	12.0
Depreciation and amortization
Depreciation expense and amortization	11.2	8.4	12.7
Impairment of goodwill and intangible assets
Impairment of goodwill and intangible assets			135.3
Operating income (loss)
Total operating income (loss)	33.5	21.8	(114.9)
Operating Segments | Aviation | Lease Type Contracts
Services revenue
Services revenue	14.0	9.1	8.6
Operating Segments | Aviation | Management Type Contracts
Services revenue
Services revenue	241.9	153.4	141.5
Segment Reconciling Items
General and administrative expenses
General and administrative expenses	67.2	53.4	54.8
Depreciation and amortization
Depreciation expense and amortization	5.4	3.2	3.1
Operating income (loss)
Total operating income (loss)	$ (72.6)	$ (56.6)	$ (57.9)