Debt (Narrative) (Details)	12 Months Ended											12 Months Ended			6 Months Ended		12 Months Ended	0 Months Ended							12 Months Ended						12 Months Ended							12 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2013 Secured Notes Through One Term Asset-backed Securitization Transaction [Member] Secured Debt [Member] USD ($)	Dec. 31, 2012 Secured Notes Through One Term Asset-backed Securitization Transaction [Member] Secured Debt [Member] USD ($)	Dec. 31, 2012 Secured Notes Sold Through Term Asset-backed Securitization Transaction [Member] Secured Debt [Member] USD ($)	Dec. 31, 2013 Term Asset-Backed Securitization VIEs [Member] Secured Debt [Member] USD ($)	Dec. 31, 2012 Term Asset-Backed Securitization VIEs [Member] Secured Debt [Member] USD ($)	Dec. 31, 2013 Medium-Term Notes Due 2017 [Member] USD ($)	Dec. 31, 2013 Medium-Term Notes Due 2015 [Member] USD ($)	Dec. 31, 2013 Medium-Term Notes Due 2018 [Member] USD ($)	Dec. 31, 2011 Senior Unsecured Notes Effective February 2009 [Member] Senior Notes [Member] USD ($)	Dec. 31, 2010 Senior Unsecured Notes Effective February 2009 [Member] Senior Notes [Member] USD ($)	Feb. 28, 2009 Senior Unsecured Notes Effective February 2009 [Member] Senior Notes [Member] USD ($)	Dec. 31, 2013 Credit Agreement [Member] Global Credit Facilities [Member]	Jun. 30, 2013 Credit Agreement [Member] Global Credit Facilities [Member]	Dec. 31, 2013 Credit Agreement [Member] Global Credit Facilities [Member]	Apr. 13, 2012 Line of Credit [Member] Credit Facility Maturing April 2017 [Member] USD ($)	Apr. 13, 2012 Line of Credit [Member] Credit Facility Maturing April 2015 [Member] USD ($)	Sep. 13, 2013 Revolving Credit Facility [Member] Asset-Backed U.S. Commercial Paper Conduit Facility VIE [Member] Line of Credit [Member] USD ($)	Dec. 31, 2013 Financial Services Segment [Member] Medium-term Notes [Member] USD ($)	Dec. 31, 2012 Financial Services Segment [Member] Medium-term Notes [Member] USD ($)	Dec. 31, 2013 Financial Services Segment [Member] Medium-Term Notes Due 2017 [Member] Medium-term Notes [Member] USD ($)	Dec. 31, 2013 Financial Services Segment [Member] Medium-Term Notes Due 2015 [Member] Medium-term Notes [Member] USD ($)	Dec. 31, 2013 Financial Services Segment [Member] Medium-Term Notes Due 2018 [Member] Medium-term Notes [Member] USD ($)	Dec. 31, 2012 Financial Services Segment [Member] Medium-Term Notes Due 2018 [Member] Medium-term Notes [Member] USD ($)	Dec. 31, 2011 Financial Services Segment [Member] Medium-Term Notes Due 2018 [Member] Medium-term Notes [Member] USD ($)	Dec. 31, 2012 Financial Services Segment [Member] Medium-term Notes Matured [Member] Medium-term Notes [Member] USD ($)	Dec. 31, 2013 Financial Services Segment [Member] Revolving Credit Facility [Member] Asset-Backed U.S. Commercial Paper Conduit Facility VIE [Member] USD ($)	Dec. 31, 2012 Financial Services Segment [Member] Revolving Credit Facility [Member] Asset-Backed U.S. Commercial Paper Conduit Facility VIE [Member] USD ($)	Dec. 31, 2013 Variable Interest Entity, Not Primary Beneficiary [Member] Asset-backed Canadian Commercial Paper Conduit Facility [Member] Foreign Line of Credit [Member] USD ($)	Dec. 31, 2013 Variable Interest Entity, Not Primary Beneficiary [Member] Asset-backed Canadian Commercial Paper Conduit Facility [Member] Foreign Line of Credit [Member] CAD	Dec. 31, 2012 Variable Interest Entity, Not Primary Beneficiary [Member] Asset-backed Canadian Commercial Paper Conduit Facility [Member] Foreign Line of Credit [Member] USD ($)	Dec. 31, 2013 Variable Interest Entity, Not Primary Beneficiary [Member] Line of Credit [Member] Asset-backed Canadian Commercial Paper Conduit Facility [Member] Foreign Line of Credit [Member] USD ($)	Dec. 31, 2013 Variable Interest Entity, Not Primary Beneficiary [Member] Financial Services Segment [Member] Asset-backed Canadian Commercial Paper Conduit Facility [Member] Foreign Line of Credit [Member] USD ($)	Dec. 31, 2012 Variable Interest Entity, Not Primary Beneficiary [Member] Financial Services Segment [Member] Asset-backed Canadian Commercial Paper Conduit Facility [Member] Foreign Line of Credit [Member] USD ($)	Jun. 30, 2013 Variable Interest Entity, Not Primary Beneficiary [Member] Financial Services Segment [Member] Asset-backed Canadian Commercial Paper Conduit Facility [Member] Foreign Line of Credit [Member] CAD	Dec. 31, 2013 Unsecured Commercial Paper [Member]	Dec. 31, 2011 Unsecured Commercial Paper [Member]
Debt Instrument [Line Items]
Maturity date of Debt Instrument																		5 years	4 years												5 years	5 years						365 days
Weighted-average interest rate of commercial paper																																						0.23%	0.75%
Line of credit facility, maximum borrowing capacity																		$ 675,000,000	$ 675,000,000	$ 600,000,000												200,000,000					200,000,000
Line of credit facility, outstanding borrowings																													0	0
Face Amount of Finance Receivables Transferred																															101,100,000		230,000,000		101,100,000	230,000,000
Proceeds from Sale of Finance Receivables																																	201,300,000	88,600,000	88,600,000	201,300,000
Long-term Debt, Current Maturities	1,176,140,000	437,162,000					334,600,000	399,500,000																											38,600,000	37,700,000
Debt instrument, face amount				650,000,000	675,300,000	89,500,000			400,000,000	600,000,000	910,500,000.0		600,000,000.0	600,000,000.0									400,000,000	600,000,000				400,000,000
Debt Instrument, Unamortized Discount (Premium), Net							500,000	1,200,000					1,400,000								1,500,000	2,200,000
Weighted average interest rate of asset-backed securitization transactions									2.70%	1.15%	6.80%			15.00%									2.70%	1.15%	6.80%			5.25%
Repurchase Of Medium Term Notes													380,800,000												23,000,000	16,600,000	49,900,000
Loss on debt extinguishment	4,947,000	4,323,000	9,608,000									(85,200,000)													4,900,000	4,300,000	9,600,000
Debt Instrument, Repurchased Face Amount													$ 297,000,000
Debt Instrument, Covenant, Debt to Equity Ratio, Maximum																	10.0
Debt Instrument, Covenant, Interest Coverage Ratio, Minimum															2.5	2.25