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Debt (Summary of Term ABS Financings) (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2018 USD ($)
Term ABS 2015-2 [Member] |  |
Debt Instrument [Line Items] |  |
Close Date | Aug. 20, 2015 |
Net Book Value of Loans Contributed at Closing | $ 375.5 |
Maturity Date | Aug. 15, 2017 | [1],[2]
Term ABS 2016-1 [Member] |  |
Debt Instrument [Line Items] |  |
Close Date | Feb. 26, 2016 |
Net Book Value of Loans Contributed at Closing | $ 481.4 |
Maturity Date | Feb. 15, 2018 | [1],[2]
Term ABS 2016-2 [Member] |  |
Debt Instrument [Line Items] |  |
Close Date | May 12, 2016 |
Net Book Value of Loans Contributed at Closing | $ 437.8 |
Maturity Date | May 15, 2018 | [1],[2]
Term ABS 2016-3 [Member] |  |
Debt Instrument [Line Items] |  |
Close Date | Oct. 27, 2016 |
Net Book Value of Loans Contributed at Closing | $ 437.8 |
Maturity Date | Oct. 15, 2018 | [1],[2]
Term ABS 2017-1 [Member] |  |
Debt Instrument [Line Items] |  |
Close Date | Feb. 23, 2017 |
Net Book Value of Loans Contributed at Closing | $ 437.8 |
Maturity Date | Feb. 15, 2019 | [1],[2]
Term ABS 2017-2 [Member] |  |
Debt Instrument [Line Items] |  |
Close Date | Jun. 29, 2017 |
Net Book Value of Loans Contributed at Closing | $ 563.2 |
Maturity Date | Jun. 17, 2019 | [1],[2]
Term ABS 2017-3 [Member] |  |
Debt Instrument [Line Items] |  |
Close Date | Oct. 26, 2017 |
Net Book Value of Loans Contributed at Closing | $ 437.6 |
Maturity Date | Oct. 15, 2019 | [1],[2]
Term ABS 2018-1 [Member] |  |
Debt Instrument [Line Items] |  |
Close Date | Feb. 22, 2018 |
Net Book Value of Loans Contributed at Closing | $ 625.1 |
Maturity Date | Feb. 17, 2020 | [1],[2]
Term ABS 2018-2 [Member] |  |
Debt Instrument [Line Items] |  |
Close Date | May 24, 2018 |
Net Book Value of Loans Contributed at Closing | $ 562.6 |
Maturity Date | May 15, 2020 | [1],[2]
Term ABS 2018-3 [Member] |  |
Debt Instrument [Line Items] |  |
Close Date | Aug. 23, 2018 |
Net Book Value of Loans Contributed at Closing | $ 500.1 |
Maturity Date | Aug. 17, 2020 | [1],[2]
[1] | Financing made available only to a specified subsidiary of the Company.
[2] | Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date based on the cash flows of the pledged assets.

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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