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Operating Leases - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Operating Leased Assets [Line Items]      
Total rent expense under all operating leases $ 48.2 $ 51.8 $ 53.8
U.S.      
Operating Leased Assets [Line Items]      
Total term of lease facility 30 years    
Initial term of lease facilities 15 years    
Number of additional extensions on lease facility 3    
Extended period of lease under option 5 years    
U.K.      
Operating Leased Assets [Line Items]      
Total term of lease facility 20 years    
Brazil      
Operating Leased Assets [Line Items]      
Total term of lease facility 5 years