Summary Of Significant Accounting Policies (Restricted Cash And Cash Equivalents) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Summary Of Significant Accounting Policies [Abstract]
Cash related to secured financings	$ 115.0		$ 90.2
Cash held in trusts for future vehicle service contract claims	1.2	[1]	2.2	[1]
Total restricted cash and cash equivalents	$ 116.2		$ 92.4

[1] The unearned premium and claims reserve associated with the trusts are included in accounts payable and accrued liabilities in the consolidated balance sheets.