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Significant Accounting Policies and Practices - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Parking services revenue    
Lease type contracts $ 99.5 $ 130.8
Management type contracts 94.4 92.1
Reimbursed management type contract revenue 172.9 179.0
Total parking services revenue 366.8 401.9
Cost of parking services    
Lease type contracts 94.6 125.8
Management type contracts 59.9 56.6
Reimbursed management type contract expense 172.9 179.0
Total cost of parking services 327.4 361.4
Gross profit    
Lease type contracts 4.9 5.0
Management type contracts 34.5 35.5
Total gross profit 39.4 40.5
Depreciation and amortization 4.0 $ 6.6
Accounting Standards Update 2017-10    
Cost of parking services    
Lease type contracts 31.5  
As Reported | Accounting Standards Update 2017-10    
Parking services revenue    
Lease type contracts 99.5  
Management type contracts 94.4  
Reimbursed management type contract revenue 172.9  
Total parking services revenue 366.8  
Cost of parking services    
Lease type contracts 94.6  
Management type contracts 59.9  
Reimbursed management type contract expense 172.9  
Total cost of parking services 327.4  
Gross profit    
Lease type contracts 4.9  
Management type contracts 34.5  
Total gross profit 39.4  
Depreciation and amortization 4.0  
Balances without Adoption of Topics 853 and 606 | Accounting Standards Update 2017-10    
Parking services revenue    
Lease type contracts 131.1  
Management type contracts 94.4  
Reimbursed management type contract revenue 172.9  
Total parking services revenue 398.4  
Cost of parking services    
Lease type contracts 126.1  
Management type contracts 59.9  
Reimbursed management type contract expense 172.9  
Total cost of parking services 358.9  
Gross profit    
Lease type contracts 5.0  
Management type contracts 34.5  
Total gross profit 39.5  
Depreciation and amortization 4.1  
Impact of Adoption Increase/(Decrease) | Accounting Standards Update 2017-10    
Parking services revenue    
Lease type contracts (31.6)  
Management type contracts 0.0  
Reimbursed management type contract revenue 0.0  
Total parking services revenue (31.6)  
Cost of parking services    
Lease type contracts (31.5)  
Management type contracts 0.0  
Reimbursed management type contract expense 0.0  
Total cost of parking services (31.5)  
Gross profit    
Lease type contracts (0.1)  
Management type contracts 0.0  
Total gross profit (0.1)  
Depreciation and amortization $ (0.1)