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Summary of Significant Accounting Policies - Schedule of Property and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property and Equipment      
Property and equipment, gross $ 805.4 $ 810.3  
Accumulated depreciation (669.7) (659.9)  
Property and equipment, net 135.7    
Property and equipment, net 129.4 150.4 $ 236.2
Equipment      
Property and Equipment      
Property and equipment, gross 607.7 608.9  
Leasehold Improvements and Other      
Property and Equipment      
Property and equipment, gross 151.2 153.7  
Furniture and Fixtures      
Property and Equipment      
Property and equipment, gross 46.2 45.4  
Projects In Process      
Property and Equipment      
Property and equipment, gross $ 0.3 $ 2.3