Summary of Significant Accounting Policies Summary of Significant Accounting Policies, Financing Receivables (Details) (Finance Leases Financing Receivable [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Finance Leases Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	$ 13.5	$ 13.5
Financing Receivable, Recorded Investment, Past Due	$ 0	$ 0