Asset-Backed Financing (Narrative) (Details)	12 Months Ended					12 Months Ended			12 Months Ended			12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2014 SPEs [Member] USD ($)	Dec. 31, 2013 SPEs [Member] USD ($)	Dec. 31, 2014 Term Asset-Backed Securitization VIEs [Member] Secured Debt [Member] SPEs [Member] USD ($)	Dec. 31, 2013 Term Asset-Backed Securitization VIEs [Member] Secured Debt [Member] SPEs [Member] USD ($)	Dec. 31, 2012 Term Asset-Backed Securitization Sold at Premium VIEs [Member] Secured Debt [Member] SPEs [Member] USD ($)	Dec. 31, 2014 Asset-backed Canadian Commercial Paper Conduit Facility [Member] Foreign Line of Credit [Member] Variable Interest Entity, Not Primary Beneficiary [Member] USD ($)	Dec. 31, 2013 Asset-backed Canadian Commercial Paper Conduit Facility [Member] Foreign Line of Credit [Member] Variable Interest Entity, Not Primary Beneficiary [Member] USD ($)	Dec. 31, 2014 Asset-backed Canadian Commercial Paper Conduit Facility [Member] Foreign Line of Credit [Member] Variable Interest Entity, Not Primary Beneficiary [Member] CAD	Dec. 31, 2014 Line of Credit [Member] Asset-backed Canadian Commercial Paper Conduit Facility [Member] Foreign Line of Credit [Member] Variable Interest Entity, Not Primary Beneficiary [Member] USD ($)	Dec. 31, 2014 Third-party Bank [Member] Line of Credit [Member] Asset-Backed U.S. Commercial Paper Conduit Facility VIE [Member] SPEs [Member] USD ($)	Dec. 31, 2013 Third-party Bank [Member] Line of Credit [Member] Asset-Backed U.S. Commercial Paper Conduit Facility VIE [Member] SPEs [Member] USD ($)
Variable Interest Entity [Line Items]
Assets transferred to special purpose entities				$ 924,900,000	$ 680,600,000
Debt instrument, face amount						850,000,000	650,000,000	89,500,000
Financial Services interest expense	164,476,000	165,491,000	195,990,000			13,500,000	14,500,000		3,500,000	3,400,000			1,100,000	1,200,000
Weighted average interest rate at date of issuance						0.94%	0.99%			2.03%
Total aggregate commitment											200,000,000		600,000,000
Line of credit facility, outstanding borrowings													0
Maturity date of Debt Instrument									5 years 0 months 0 days
Face Amount of Finance Receivables Transferred									97,100,000	101,100,000
Proceeds from Sale of Finance Receivables										88,600,000		85,000,000
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount									$ 27,500,000