Business Unit Segment Information - Schedule of Revenues and Gross Profit by Regions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Services Revenue
Services Revenue	$ 203.4	$ 414.2	$ 613.1	$ 823.6
Gross Profit
Gross profit	(13.4)	61.9	(43.6)	115.1
Operating Segments | Commercial
Services Revenue
Services Revenue	70.3	157.8	218.6	315.7
Gross Profit
Gross profit	(18.3)	34.2	(71.3)	63.6
Operating Segments | Aviation
Services Revenue
Services Revenue	21.1	74.9	89.0	145.2
Gross Profit
Gross profit	1.5	22.1	16.4	39.3
Segment Reconciling Items
Services Revenue
Services Revenue	1.6	2.4	4.2	4.9
Gross Profit
Gross profit	3.4	5.6	11.3	12.2
Lease Type Contracts
Services Revenue
Services Revenue	30.2	105.2	111.9	203.0
Gross Profit
Gross profit	(12.9)	13.4	(11.4)	21.5
Lease Type Contracts | Operating Segments | Commercial
Services Revenue
Services Revenue	28.8	96.9	105.1	187.4
Gross Profit
Gross profit	$ (13.8)	$ 9.8	$ (14.7)	$ 14.8
Gross margin percentage	(47.90%)	10.10%	(14.00%)	7.90%
Lease Type Contracts | Operating Segments | Aviation
Services Revenue
Services Revenue	$ 1.3	$ 8.2	$ 6.5	$ 15.3
Gross Profit
Gross profit	$ (0.3)	$ 2.5		$ 4.0
Gross margin percentage	(23.10%)	30.50%		26.10%
Lease Type Contracts | Segment Reconciling Items
Services Revenue
Services Revenue	$ 0.1	$ 0.1	0.3	$ 0.3
Gross Profit
Gross profit	1.2	1.1	3.3	2.7
Management Type Contracts
Services Revenue
Services Revenue	62.8	129.9	199.9	262.8
Gross Profit
Gross profit	16.2	48.5	62.0	93.6
Management Type Contracts | Operating Segments | Commercial
Services Revenue
Services Revenue	41.5	60.9	113.5	128.3
Gross Profit
Gross profit	$ 12.2	$ 24.4	$ 37.6	$ 48.8
Gross margin percentage	29.40%	40.10%	33.10%	38.00%
Management Type Contracts | Operating Segments | Aviation
Services Revenue
Services Revenue	$ 19.8	$ 66.7	$ 82.5	$ 129.9
Gross Profit
Gross profit	$ 1.8	$ 19.6	$ 16.4	$ 35.3
Gross margin percentage	9.10%	29.40%	19.90%	27.20%
Management Type Contracts | Segment Reconciling Items
Services Revenue
Services Revenue	$ 1.5	$ 2.3	$ 3.9	$ 4.6
Gross Profit
Gross profit	2.2	4.5	8.0	9.5
Reimbursed Management Type Contract Revenue
Services Revenue
Services Revenue	110.4	$ 179.1	301.3	$ 357.8
Lease impairment | Operating Segments
Gross Profit
Gross profit	$ (16.7)		$ (94.2)