Debt (Narrative) (Details) (USD $) In Millions, unless otherwise specified				1 Months Ended
	Mar. 31, 2012 Senior Secured Term Loan A Facility [Member]	Mar. 31, 2012 Senior Secured Term Loan B Facility [Member]	Mar. 31, 2012 Senior Secured Credit Facility [Member]	Feb. 29, 2012 Amended Securitization Facility [Member]	Mar. 31, 2012 LIBOR Plus [Member] Senior Secured Term Loan A Facility [Member]	Mar. 31, 2012 LIBOR Plus [Member] Senior Secured Term Loan B Facility [Member]	Feb. 29, 2012 Securitization Facility [Member]
Debt Instrument [Line Items]
Borrowing under the credit facility	$ 150	$ 150	$ 300	$ 400			$ 300
Basis spread on variable rate				0.90%	2.25%	3.00%
Debt instrument maturity year	March 2016	January 2017		February 2015
Unused line fee for securitization facility				0.45%