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Restructuring Costs - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Restructuring And Related Activities [Abstract]      
Restructuring costs $ 48.2 $ 39.8  
Office closure costs 8.2    
Costs paid, utilized or transferred out 20.4    
Reserve will be paid by end of period $ 35.1   $ 7.3