Loans Receivable (Narrative) (Details) - USD ($) $ in Millions |
12 Months Ended | |
---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
Age of Consumer Loans contractual payments due with no forecasted future net cash flows | 120 months | |
Impact of Forecast Change on Credit Losses | $ 41.6 | |
Impact of Forecast Change on Finance Charges | 7.3 | |
Impact of Forecast Change on Net Income | $ 30.8 | |
Decrease in Forecated Net Cash Flows | $ 1.8 |