Loans Receivable (Summary Of Changes In Allowance For Credit Losses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 185.8		$ 161.9		$ 176.4		$ 154.3
Provision for credit losses	6.1		9.8		17.3		17.8
Write-offs	(1.6)		(1.5)		(4.7)		(3.0)
Recoveries	0.6	[1]	0.6	[1]	1.9	[1]	1.7	[1]
Balance, end of period	190.9		170.8		190.9		170.8
Dealer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	175.5		152.0		167.4		141.7
Provision for credit losses	6.4		10.2		16.3		20.4
Write-offs	(1.6)		(1.5)		(4.6)		(2.5)
Recoveries	0.5	[1]	0.6	[1]	1.7	[1]	1.7	[1]
Balance, end of period	180.8		161.3		180.8		161.3
Purchased Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	10.3		9.9		9.0		12.6
Provision for credit losses	(0.3)		(0.4)		1.0		(2.6)
Write-offs					(0.1)		(0.5)
Recoveries	0.1	[1]			0.2	[1]
Balance, end of period	$ 10.1		$ 9.5		$ 10.1		$ 9.5

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