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Inventory Financing Agreements (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Inventory Financing Agreements [Line Items]    
Accounts payable-inventory financing $ 498.0 $ 580.4
Accounts Payable, Inventory Financing    
Inventory Financing Agreements [Line Items]    
Revolving Loan financing agreement 480.9 558.3
Other inventory financing agreements 17.1 22.1
Accounts payable-inventory financing 498.0 580.4
Accounts Payable, Inventory Financing Collateralized    
Inventory Financing Agreements [Line Items]    
Other inventory financing agreements $ 1.0 $ 3.0