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Other Income (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |
Other Income | $ 62.4 | $ 57.4 | $ 51.9
Ancillary Product Profit Sharing [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 30.6 | 23.9 | 15.5
Remarketing Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 11.2 | 10.9 | 9.2
GPS-SID Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 6.4 | 11.1 | 13.5
Interest Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 5.0 | 2.2 | 1.7
Dealer Enrollment Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 4.3 | 3.9 | 5.0
Dealer Support Products And Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 4.1 | 4.8 | 4.7
Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 0.8 | $ 0.6 | $ 2.3
Third Party Providers [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 42.8 |  |
Third Party Providers [Member] | Ancillary Product Profit Sharing [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 30.6 |  |
Third Party Providers [Member] | Remarketing Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 0.0 |  |
Third Party Providers [Member] | GPS-SID Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 6.4 |  |
Third Party Providers [Member] | Interest Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 5.0 |  |
Third Party Providers [Member] | Dealer Enrollment Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 0.0 |  |
Third Party Providers [Member] | Dealer Support Products And Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 0.0 |  |
Third Party Providers [Member] | Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 0.8 |  |
Dealers [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 19.6 |  |
Dealers [Member] | Ancillary Product Profit Sharing [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 0.0 |  |
Dealers [Member] | Remarketing Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 11.2 |  |
Dealers [Member] | GPS-SID Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 0.0 |  |
Dealers [Member] | Interest Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 0.0 |  |
Dealers [Member] | Dealer Enrollment Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 4.3 |  |
Dealers [Member] | Dealer Support Products And Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 4.1 |  |
Dealers [Member] | Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 0.0 |  |
Transferred over Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 39.9 |  |
Transferred over Time [Member] | Ancillary Product Profit Sharing [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 30.6 |  |
Transferred over Time [Member] | Remarketing Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 0.0 |  |
Transferred over Time [Member] | GPS-SID Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 0.0 |  |
Transferred over Time [Member] | Interest Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 5.0 |  |
Transferred over Time [Member] | Dealer Enrollment Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 4.3 |  |
Transferred over Time [Member] | Dealer Support Products And Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 0.0 |  |
Transferred over Time [Member] | Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 0.0 |  |
Transferred at Point in Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 22.5 |  |
Transferred at Point in Time [Member] | Ancillary Product Profit Sharing [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 0.0 |  |
Transferred at Point in Time [Member] | Remarketing Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 11.2 |  |
Transferred at Point in Time [Member] | GPS-SID Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 6.4 |  |
Transferred at Point in Time [Member] | Interest Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 0.0 |  |
Transferred at Point in Time [Member] | Dealer Enrollment Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 0.0 |  |
Transferred at Point in Time [Member] | Dealer Support Products And Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 4.1 |  |
Transferred at Point in Time [Member] | Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | $ 0.8 |  |

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