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Leases Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Mar. 31, 2019
Lessee, Lease, Description [Line Items]    
Lessee, operating lease, renewal term   5 years
Rent expense, net $ 78.3  
Minimum    
Lessee, Lease, Description [Line Items]    
Lessee, operating lease, term of contract   12 months
Transportation And Material Handling Equipment [Member] | Minimum    
Lessee, Lease, Description [Line Items]    
Lessor, operating lease, term of contract   3 years
Transportation And Material Handling Equipment [Member] | Maximum    
Lessee, Lease, Description [Line Items]    
Lessor, operating lease, term of contract   10 years
Office and Warehouse Facilities [Member] | Minimum    
Lessee, Lease, Description [Line Items]    
Lessee, operating lease, term of contract   1 year
Office and Warehouse Facilities [Member] | Maximum    
Lessee, Lease, Description [Line Items]    
Lessee, operating lease, term of contract   20 years