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Overview, Basis of Presentation and Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Depreciation expense $ 1.7 $ 4.1 $ 3.1 $ 5.8  
Real Estate Held for sale 5.5   5.5   $ 5.5
Equity investments carrying value 13.3   13.3   $ 13.4
Unrealized loss on investment     0.2    
Computer Software, Intangible Asset          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Amortization expense related to internally-developed software $ 8.1 $ 7.3 $ 16.3 $ 14.6  
Maximum | Computer Software, Intangible Asset          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Estimated useful life of computer software     3 years