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Description of Business and Summary of Significant Accounting Policies - Goodwill and Finite-lived Intangible Assets (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2021
product_service_group
Mar. 31, 2021
USD ($)
Mar. 31, 2021
segment
Mar. 31, 2021
reporting_unit
Dec. 31, 2020
USD ($)
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]            
Goodwill, impairment loss | $     $ 0     $ 0
Number of operating segments   3   1    
Number of reporting units | reporting_unit         1  
Airport contracts            
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]            
Finite-lived intangible asset, useful life 9 years          
Backlog | Minimum            
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]            
Finite-lived intangible asset, useful life 1 year          
Backlog | Maximum            
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]            
Finite-lived intangible asset, useful life 1 year 6 months          
Brand            
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]            
Finite-lived intangible asset, useful life 15 years          
Customer relationships | Minimum            
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]            
Finite-lived intangible asset, useful life 7 years          
Customer relationships | Maximum            
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]            
Finite-lived intangible asset, useful life 20 years          
Database            
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]            
Finite-lived intangible asset, useful life 10 years          
Dealer networks | Minimum            
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]            
Finite-lived intangible asset, useful life 15 years          
Dealer networks | Maximum            
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]            
Finite-lived intangible asset, useful life 20 years          
Developed technology | Minimum            
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]            
Finite-lived intangible asset, useful life 3 years          
Developed technology | Maximum            
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]            
Finite-lived intangible asset, useful life 12 years          
Non-compete agreements            
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]            
Finite-lived intangible asset, useful life 5 years          
Store networks            
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]            
Finite-lived intangible asset, useful life 5 years          
Trademarks | Minimum            
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]            
Finite-lived intangible asset, useful life 3 years          
Trademarks | Maximum            
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]            
Finite-lived intangible asset, useful life 15 years