Summary Of Significant Accounting Policies (Restricted Cash And Cash Equivalents) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items]
Cash related to secured financings	$ 90.2		$ 62.5
Cash held in trusts for future vehicle service contract claims	2.2	[1]	42.2	[1]
Total restricted cash and cash equivalents	92.4		104.7
Discontinued Profit Sharing Arrangement [Member]
Summary Of Significant Accounting Policies [Line Items]
Total restricted cash and cash equivalents			0.1
VSC Re [Member]
Summary Of Significant Accounting Policies [Line Items]
Total restricted cash and cash equivalents	$ 2.2		$ 42.1

[1] The unearned premium and claims reserve associated with the trusts are included in accounts payable and accrued liabilities in the consolidated balance sheets. As of December 31, 2012, the outstanding cash balance includes $2.2 million related to VSC Re. As of December 31, 2011, the outstanding cash balance includes $42.1 million related to VSC Re and $0.1 million related to a discontinued profit sharing arrangement.