Loans Receivable (Summary Of Changes In Allowance For Credit Losses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 176.4		$ 154.3
Provision for credit losses	5.8		5.2
Write-offs	(1.1)		(0.7)
Recoveries	0.6	[1]	0.6	[1]
Balance, end of period	181.7		159.4
Dealer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	167.4		141.7
Provision for credit losses	6.0		6.6
Write-offs	(1.1)		(0.6)
Recoveries	0.6	[1]	0.6	[1]
Balance, end of period	172.9		148.3
Purchased Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	9.0		12.6
Provision for credit losses	(0.2)		(1.4)
Write-offs			(0.1)
Balance, end of period	$ 8.8		$ 11.1

[1] Represents collections received on previously written off Loans.