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Commitments and Contingencies - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
oz
$ / oz
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 01, 2019
oz
$ / oz
Guarantor Obligations [Line Items]        
Rent expense on operating leases $ 124.3 $ 117.7 $ 74.3  
Amortization of leased asset 0.3 1.0 $ 0.2  
Maximum loss exposure under outstanding letters of credit $ 6.2 $ 10.1    
Forward Contracts | Gold, Ounces        
Guarantor Obligations [Line Items]        
Investment contract weight | oz 18,000      
Derivative, average forward price | $ / oz 1,258      
Minimum        
Guarantor Obligations [Line Items]        
Operating leases term 3 years      
Maximum        
Guarantor Obligations [Line Items]        
Operating leases term 5 years      
Above Market Leases        
Guarantor Obligations [Line Items]        
Remaining amortization period 4 years 9 months 18 days      
Below Market Leases        
Guarantor Obligations [Line Items]        
Remaining amortization period 2 years 1 month 6 days      
Subsequent Event | Forward Contracts | Gold, Ounces        
Guarantor Obligations [Line Items]        
Investment contract weight | oz       18,000
Derivative, average forward price | $ / oz       1,300