Summary of Significant Accounting Policies Vendor Incentives (Details) (Other Assets Member [Member], Vendor Incentive Receivable [Member], Distribution [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Other Assets Member [Member] | Vendor Incentive Receivable [Member] | Distribution [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other Receivables	$ 17.7	$ 13.9