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Summary Of Significant Accounting Policies (Restricted Cash And Cash Equivalents) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]    
Cash related to secured financings $ 113.8 $ 90.2
Cash held in trusts for future vehicle service contract claims 2.5 2.2
Total restricted cash and cash equivalents 116.3 92.4
VSC Re [Member]
   
Summary Of Significant Accounting Policies [Line Items]    
Total restricted cash and cash equivalents $ 2.4 $ 2.2