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Segment Reporting - Segment Revenue and Segment Profit (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Revenue $ 1,026 $ 1,016 $ 2,054 $ 2,067
Segment Pre-tax Income (Loss) 74 55 134 100
Segment depreciation and amortization 54 55 109 113
Adjusted EBITDA 128 110 243 206
Unallocated costs        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Segment Pre-tax Income (Loss) (82) (79) (165) (160)
Segment depreciation and amortization 13 13 27 27
Adjusted EBITDA (69) (66) (138) (133)
Commercial Industries:        
Segment Reporting Information [Line Items]        
Segment Pre-tax Income (Loss)     64 67
Segment depreciation and amortization     52 55
Adjusted EBITDA     116 122
Commercial Industries: | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 503 520 1,029 1,092
Segment Pre-tax Income (Loss) 29 25    
Segment depreciation and amortization 25 27    
Adjusted EBITDA 54 52    
Government Services:        
Segment Reporting Information [Line Items]        
Segment Pre-tax Income (Loss)     197 160
Segment depreciation and amortization     13 13
Adjusted EBITDA     210 173
Government Services: | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 338 331 656 621
Segment Pre-tax Income (Loss) 110 90    
Segment depreciation and amortization 8 6    
Adjusted EBITDA 118 96    
Transportation:        
Segment Reporting Information [Line Items]        
Segment Pre-tax Income (Loss)     38 30
Segment depreciation and amortization     17 18
Adjusted EBITDA     55 48
Transportation: | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 185 165 369 354
Segment Pre-tax Income (Loss) 17 20    
Segment depreciation and amortization 8 9    
Adjusted EBITDA 25 29    
Education | Other        
Segment Reporting Information [Line Items]        
Segment Pre-tax Income (Loss)     0 3
Segment depreciation and amortization     0 0
Adjusted EBITDA     0 (4)
Education | Other | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 0 0 $ 0 $ 0
Segment Pre-tax Income (Loss) 0 (1)    
Segment depreciation and amortization 0 0    
Adjusted EBITDA $ 0 $ (1)