Business Unit Segment Information - Schedule of Revenues and Gross Profit by Regions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Services Revenue
Services Revenue	$ 229.1	$ 418.6	$ 842.2	$ 1,242.2
Gross Profit
Gross profit	42.0	58.7	(1.6)	173.8
Operating Segments | Commercial
Services Revenue
Services Revenue	83.9	160.9	305.2	482.3
Gross Profit
Gross profit	23.8	34.9	(47.4)	100.0
Operating Segments | Aviation
Services Revenue
Services Revenue	32.6	73.5	118.9	212.9
Gross Profit
Gross profit	14.0	19.3	30.3	57.2
Segment Reconciling Items
Services Revenue
Services Revenue	1.7	2.8	5.9	7.8
Gross Profit
Gross profit	4.2	4.5	15.5	16.6
Lease Type Contracts
Services Revenue
Services Revenue	38.5	104.6	150.4	307.6
Gross Profit
Gross profit	4.1	11.6	(7.3)	33.1
Lease Type Contracts | Operating Segments | Commercial
Services Revenue
Services Revenue	37.4	96.2	142.5	283.6
Gross Profit
Gross profit	$ 3.3	$ 7.8	$ (11.4)	$ 22.6
Gross margin percentage	8.80%	8.10%	(8.00%)	8.00%
Lease Type Contracts | Operating Segments | Aviation
Services Revenue
Services Revenue	$ 1.0	$ 8.1	$ 7.5	$ 23.4
Gross Profit
Gross profit	$ 0.3	$ 2.4	$ 0.3	$ 6.4
Gross margin percentage	30.00%	29.60%	4.00%	27.40%
Lease Type Contracts | Segment Reconciling Items
Services Revenue
Services Revenue	$ 0.1	$ 0.3	$ 0.4	$ 0.6
Gross Profit
Gross profit	0.5	1.4	3.8	4.1
Management Type Contracts
Services Revenue
Services Revenue	79.7	132.6	279.6	395.4
Gross Profit
Gross profit	38.2	47.1	100.2	140.7
Management Type Contracts | Operating Segments | Commercial
Services Revenue
Services Revenue	46.5	64.7	162.7	198.7
Gross Profit
Gross profit	$ 20.8	$ 27.1	$ 58.5	$ 77.4
Gross margin percentage	44.70%	41.90%	36.00%	39.00%
Management Type Contracts | Operating Segments | Aviation
Services Revenue
Services Revenue	$ 31.6	$ 65.4	$ 111.4	$ 189.5
Gross Profit
Gross profit	$ 13.7	$ 16.9	$ 30.0	$ 50.8
Gross margin percentage	43.40%	25.80%	26.90%	26.80%
Management Type Contracts | Segment Reconciling Items
Services Revenue
Services Revenue	$ 1.6	$ 2.5	$ 5.5	$ 7.2
Gross Profit
Gross profit	3.7	3.1	11.7	12.5
Reimbursed Management Type Contract Revenue
Services Revenue
Services Revenue	110.9	$ 181.4	412.2	$ 539.2
Lease impairment | Operating Segments
Gross Profit
Gross profit	$ (0.3)		$ (94.5)