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Loans Receivable (Summary of Changes In Allowance for Credit Losses) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Allowance for Loan and Lease Losses [Roll Forward]        
Balance, beginning of period $ 276.9 $ 217.9 $ 243.6 $ 206.9
Provision for credit losses 22.8 13.2 62.8 27.8
Write-offs (3.3) (1.3) (10.7) (5.9)
Recoveries [1],[2] 0.4 0.4 1.1 1.4
Balance, end of period 296.8 230.2 296.8 230.2
Dealer Loans [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance, beginning of period 268.2 209.4 235.1 198.1
Provision for credit losses 21.6 13.4 61.3 28.2
Write-offs (3.1) (1.3) (10.4) (5.7)
Recoveries [1],[2] 0.3 0.3 1.0 1.2
Balance, end of period 287.0 221.8 287.0 221.8
Purchased Loans [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance, beginning of period 8.7 8.5 8.5 8.8
Provision for credit losses 1.2 (0.2) 1.5 (0.4)
Write-offs (0.2) 0.0 (0.3) (0.2)
Recoveries [1],[2] 0.1 0.1 0.1 0.2
Balance, end of period $ 9.8 $ 8.4 $ 9.8 $ 8.4
[1] Represents collections received on previously written off Loans.
[2] Represents collections received on previously written off Loans.