Business Unit Segment Information - Schedule of Revenues and Gross Profit by Regions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Services Revenue
Services Revenue	$ 246.7	$ 409.7
Gross Profit
Gross profit	38.3	(30.2)
Operating Segments | Commercial
Services Revenue
Services Revenue	96.3	150.8
Gross Profit
Gross profit	27.1	(52.7)
Operating Segments | Aviation
Services Revenue
Services Revenue	30.7	65.4
Gross Profit
Gross profit	7.1	14.6
Segment Reconciling Items
Services Revenue
Services Revenue	1.7	2.6
Gross Profit
Gross profit	4.1	7.9
Lease Type Contracts
Services Revenue
Services Revenue	42.7	81.7
Gross Profit
Gross profit	7.4	1.5
Lease Type Contracts | Operating Segments | Commercial
Services Revenue
Services Revenue	41.3	76.3
Gross Profit
Gross profit	$ 6.2	$ (0.9)
Gross margin percentage	15.00%	(1.20%)
Lease Type Contracts | Operating Segments | Aviation
Services Revenue
Services Revenue	$ 1.3	$ 5.2
Gross Profit
Gross profit	$ 0.4	$ 0.3
Gross margin percentage	30.80%	5.80%
Lease Type Contracts | Segment Reconciling Items
Services Revenue
Services Revenue	$ 0.1	$ 0.2
Gross Profit
Gross profit	0.8	2.1
Management Type Contracts
Services Revenue
Services Revenue	86.0	137.1
Gross Profit
Gross profit	31.0	45.8
Management Type Contracts | Operating Segments | Commercial
Services Revenue
Services Revenue	55.0	74.5
Gross Profit
Gross profit	$ 20.9	$ 25.7
Gross margin percentage	38.00%	34.50%
Management Type Contracts | Operating Segments | Aviation
Services Revenue
Services Revenue	$ 29.4	$ 60.2
Gross Profit
Gross profit	$ 6.8	$ 14.3
Gross margin percentage	23.10%	23.80%
Management Type Contracts | Segment Reconciling Items
Services Revenue
Services Revenue	$ 1.6	$ 2.4
Gross Profit
Gross profit	3.3	5.8
Reimbursed Management Type Contract Revenue
Services Revenue
Services Revenue	118.0	190.9
Lease Impairment
Gross Profit
Gross profit	(0.1)	(77.5)
Lease Impairment | Operating Segments
Gross Profit
Gross profit	$ (0.1)	$ (77.5)