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Other Income (Disaggregation of Revenue) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | $ 12.6 | $ 7.0 | $ 34.8 | $ 35.2
Ancillary Product Profit Sharing [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 9.6 | 4.1 | 25.0 | 22.3
Remarketing Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 1.9 | 1.1 | 6.0 | 5.7
Interest [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.2 | 0.4 | 0.9 | 2.6
Dealer Enrollment Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.5 | 0.7 | 1.6 | 2.5
Dealer Support Products And Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.2 | 0.5 | 0.9 | 1.5
Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.2 | $ 0.2 | 0.4 | $ 0.6
Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 10.3 |  | 27.5 |
Transferred over Time [Member] | Ancillary Product Profit Sharing [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 9.6 |  | 25.0 |
Transferred over Time [Member] | Remarketing Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Transferred over Time [Member] | Interest [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.2 |  | 0.9 |
Transferred over Time [Member] | Dealer Enrollment Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.5 |  | 1.6 |
Transferred over Time [Member] | Dealer Support Products And Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Transferred over Time [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 2.3 |  | 7.3 |
Transferred at Point in Time [Member] | Ancillary Product Profit Sharing [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Transferred at Point in Time [Member] | Remarketing Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 1.9 |  | 6.0 |
Transferred at Point in Time [Member] | Interest [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Transferred at Point in Time [Member] | Dealer Enrollment Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Transferred at Point in Time [Member] | Dealer Support Products And Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.2 |  | 0.9 |
Transferred at Point in Time [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.2 |  | 0.4 |
Third Party Providers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 10.0 |  | 26.3 |
Third Party Providers [Member] | Ancillary Product Profit Sharing [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 9.6 |  | 25.0 |
Third Party Providers [Member] | Remarketing Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Third Party Providers [Member] | Interest [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.2 |  | 0.9 |
Third Party Providers [Member] | Dealer Enrollment Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Third Party Providers [Member] | Dealer Support Products And Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Third Party Providers [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.2 |  | 0.4 |
Dealers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 2.6 |  | 8.5 |
Dealers [Member] | Ancillary Product Profit Sharing [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Dealers [Member] | Remarketing Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 1.9 |  | 6.0 |
Dealers [Member] | Interest [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Dealers [Member] | Dealer Enrollment Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.5 |  | 1.6 |
Dealers [Member] | Dealer Support Products And Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.2 |  | 0.9 |
Dealers [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | $ 0.0 |  | $ 0.0 |

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