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Loans Receivable (Summary of Changes In Allowance for Credit Losses) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]    
Balance, beginning of period $ 320.4 $ 243.6
Provision for credit losses 20.5 22.1
Write-offs (3.2) (3.2)
Recoveries [1],[2] 0.3 0.3
Balance, end of period 338.0 262.8
Dealer Loans [Member]    
Allowance for Loan and Lease Losses [Roll Forward]    
Balance, beginning of period 309.3 235.1
Provision for credit losses 17.2 21.8
Write-offs (3.0) (3.2)
Recoveries [1],[2] 0.3 0.3
Balance, end of period 323.8 254.0
Purchased Loans [Member]    
Allowance for Loan and Lease Losses [Roll Forward]    
Balance, beginning of period 11.1 8.5
Provision for credit losses 3.3 0.3
Write-offs (0.2) 0.0
Recoveries [1],[2] 0.0 0.0
Balance, end of period $ 14.2 $ 8.8
[1] Represents collections received on previously written off Loans.
[2] Represents collections received on previously written off Loans.