Credit Facilities and Long-Term Debt (Details Textual)	12 Months Ended				12 Months Ended					12 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2013 Letter of Credit USD ($)	Dec. 31, 2013 Revolving Credit Facility USD ($)	Dec. 31, 2013 Risk Sharing Finance Facility Agreement [Member] USD ($)	Dec. 31, 2013 Risk Sharing Finance Facility Agreement [Member] EUR (€)	Dec. 31, 2013 Revolving Credit Facility and Senior Notes [Member] USD ($)	Dec. 31, 2012 Revolving Credit Facility and Senior Notes [Member] USD ($)	Dec. 31, 2013 Senior Notes	Sep. 20, 2011 Senior Notes Due 2016, 3.550% USD ($)	Sep. 20, 2011 Senior Notes Due 2021, 4.875% USD ($)	Dec. 31, 2013 Level 2 Senior Notes Due 2016, 3.550% USD ($)	Dec. 31, 2012 Level 2 Senior Notes Due 2016, 3.550% USD ($)	Dec. 31, 2013 Level 2 Senior Notes Due 2021, 4.875% USD ($)	Dec. 31, 2012 Level 2 Senior Notes Due 2021, 4.875% USD ($)
Credit Facilities and Long-Term Debt [Abstract]
Fair value of senior notes due													$ 635,000,000	$ 639,000,000	$ 629,000,000	$ 680,000,000
Deferred financing costs								7,000,000	9,000,000
Deferred financing costs expected amortization 2014								2,000,000
Deferred financing costs expected amortization 2015								2,000,000
Deferred financing costs expected amortization 2016								1,000,000
Deferred financing costs expected amortization 2017								1,000,000
Deferred financing costs expected amortization 2018 (less than $1million)								1,000,000
Deferred financing costs expected amortzation thereafter								1,000,000
Interest on notes due											3.55%	4.875%
Senior notes issued											600,000,000	600,000,000
Gross proceeds from notes issue	0	0	1,198,000,000
Redemption price percentage										101.00%
Debt instrument aggregate principal amount				100,000,000	600,000,000	165,000,000	120,000,000
Interest rate per annum, effective rate					0.50%
Maximum leverage ratio					3.50	3.50	3.50
Line of Credit Facility, Amount Outstanding						$ 38,000,000