Inventory Financing Agreements (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Inventory Financing Agreements [Line Items]
Accounts payable-inventory financing	$ 496.4	$ 580.4
Accounts Payable, Inventory Financing
Inventory Financing Agreements [Line Items]
Revolving Loan inventory financing agreement	474.7	558.3
Other inventory financing agreements	21.7	22.1
Accounts payable-inventory financing	496.4	580.4
Accounts Payable, Inventory Financing Collateralized
Inventory Financing Agreements [Line Items]
Other inventory financing agreements	$ 1.0	$ 3.0