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Commitments and Contingencies - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 21, 2001
Commitments and Contingencies [Line Items]        
Accrued liabilities related to retained risks $ 142,000,000 $ 152,600,000    
Rent expenses $ 143,300,000 $ 135,400,000 $ 127,300,000  
Minimum        
Commitments and Contingencies [Line Items]        
Lease term 1 year      
Maximum        
Commitments and Contingencies [Line Items]        
Lease term 20 years      
Contingent Promissory Note        
Commitments and Contingencies [Line Items]        
Principal amount of contingent promissory note $ 40,000,000      
Promissory note term 20 years      
Contingent promissory note, maximum amount including interest $ 96,000,000      
DFA        
Commitments and Contingencies [Line Items]        
Acquired interest (as a percent)       33.80%