Business Unit Segment Information - Schedule of Revenues and Gross Profit by Regions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Parking Services Revenue
Total Services Revenue	$ 409.7	$ 409.4
Gross Profit
Total gross profit	(30.2)	53.2
Operating segment | Commercial
Parking Services Revenue
Total Services Revenue	148.3	158.0
Gross Profit
Total gross profit	(53.0)	29.3
Operating segment | Aviation
Parking Services Revenue
Total Services Revenue	67.9	70.2
Gross Profit
Total gross profit	14.9	17.2
Segment Reconciling Items
Parking Services Revenue
Total Services Revenue	2.6	2.5
Gross Profit
Total gross profit	7.9	6.7
Lease type contracts
Parking Services Revenue
Total Services Revenue	81.7	97.8
Gross Profit
Total gross profit	1.5	8.1
Lease type contracts | Operating segment | Commercial
Parking Services Revenue
Total Services Revenue	76.3	90.6
Gross Profit
Total gross profit	$ (0.9)	$ 4.9
Gross margin percentage	(1.20%)	5.40%
Lease type contracts | Operating segment | Aviation
Parking Services Revenue
Total Services Revenue	$ 5.2	$ 7.0
Gross Profit
Total gross profit	$ 0.3	$ 1.4
Gross margin percentage	5.80%	20.00%
Lease type contracts | Segment Reconciling Items
Parking Services Revenue
Total Services Revenue	$ 0.2	$ 0.2
Gross Profit
Total gross profit	2.1	1.8
Management type contracts
Parking Services Revenue
Total Services Revenue	137.1	132.9
Gross Profit
Total gross profit	45.8	45.1
Management type contracts | Operating segment | Commercial
Parking Services Revenue
Total Services Revenue	72.0	67.4
Gross Profit
Total gross profit	$ 25.4	$ 24.4
Gross margin percentage	35.30%	36.20%
Management type contracts | Operating segment | Aviation
Parking Services Revenue
Total Services Revenue	$ 62.7	$ 63.2
Gross Profit
Total gross profit	$ 14.6	$ 15.8
Gross margin percentage	23.30%	25.00%
Management type contracts | Segment Reconciling Items
Parking Services Revenue
Total Services Revenue	$ 2.4	$ 2.3
Gross Profit
Total gross profit	5.8	4.9
Lease impairment | Operating segment
Gross Profit
Total gross profit	(77.5)	0.0
Reimbursed management type contract revenue
Parking Services Revenue
Total Services Revenue	$ 190.9	$ 178.7