Inventory Financing Agreements (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Inventory Financing Agreements [Line Items]
Accounts payable-inventory financing	$ 387.6	$ 498.0
Accounts Payable, Inventory Financing
Inventory Financing Agreements [Line Items]
Revolving Loan inventory financing agreement	380.0	480.9
Other inventory financing agreements	$ 7.6	$ 17.1