Segment Information - Schedule of Revenues and Gross Profit by Regions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Services Revenue
Services Revenue	$ 311.6	$ 229.1	$ 834.0	$ 842.2
Gross Profit
Gross profit	46.0	42.0	130.8	(1.6)
Operating Segments | Commercial
Services Revenue
Services Revenue	114.1	83.9	312.8	305.2
Gross Profit
Gross profit	30.4	23.8	88.8	(47.4)
Operating Segments | Aviation
Services Revenue
Services Revenue	45.3	32.6	112.8	118.9
Gross Profit
Gross profit	10.0	14.0	27.0	30.3
Segment Reconciling Items
Services Revenue
Services Revenue	2.2	1.7	5.9	5.9
Gross Profit
Gross profit	5.6	4.2	15.0	15.5
Lease Type Contracts
Services Revenue
Services Revenue	59.7	38.5	153.3	150.4
Gross Profit
Gross profit	11.7	4.1	30.5	(7.3)
Lease Type Contracts | Operating Segments | Commercial
Services Revenue
Services Revenue	56.7	37.4	146.7	142.5
Gross Profit
Gross profit	$ 9.5	$ 3.3	$ 25.2	$ (11.4)
Gross margin percentage	16.80%	8.80%	17.20%	(8.00%)
Lease Type Contracts | Operating Segments | Aviation
Services Revenue
Services Revenue	$ 2.8	$ 1.0	$ 6.2	$ 7.5
Gross Profit
Gross profit	$ 1.1	$ 0.3	$ 2.4	$ 0.3
Gross margin percentage	39.30%	30.00%	38.70%	4.00%
Lease Type Contracts | Segment Reconciling Items
Services Revenue
Services Revenue	$ 0.2	$ 0.1	$ 0.4	$ 0.4
Gross Profit
Gross profit	1.1	0.5	2.9	3.8
Management Type Contracts
Services Revenue
Services Revenue	101.9	79.7	278.2	279.6
Gross Profit
Gross profit	37.8	38.2	103.9	100.2
Management Type Contracts | Operating Segments | Commercial
Services Revenue
Services Revenue	57.4	46.5	166.1	162.7
Gross Profit
Gross profit	$ 24.4	$ 20.8	$ 67.1	$ 58.5
Gross margin percentage	42.50%	44.70%	40.40%	36.00%
Management Type Contracts | Operating Segments | Aviation
Services Revenue
Services Revenue	$ 42.5	$ 31.6	$ 106.6	$ 111.4
Gross Profit
Gross profit	$ 8.9	$ 13.7	$ 24.7	$ 30.0
Gross margin percentage	20.90%	43.40%	23.20%	26.90%
Management Type Contracts | Segment Reconciling Items
Services Revenue
Services Revenue	$ 2.0	$ 1.6	$ 5.5	$ 5.5
Gross Profit
Gross profit	4.5	3.7	12.1	11.7
Reimbursed Management Type Contract Revenue
Services Revenue
Services Revenue	150.0	110.9	402.5	412.2
Lease Impairment
Gross Profit
Gross profit	(3.5)	(0.3)	(3.6)	(94.5)
Lease Impairment | Operating Segments | Commercial
Gross Profit
Gross profit	$ (3.5)	$ (0.3)	(3.5)	$ (94.5)
Lease Impairment | Operating Segments | Aviation
Gross Profit
Gross profit			$ (0.1)