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Other income (Schedule of Other Income) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | $ 10.5 | $ 13.9 | $ 22.2 | $ 28.2
Ancillary Product Profit Sharing [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 7.2 | 10.0 | 15.4 | 18.2
Remarketing Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 1.9 | 1.8 | 4.1 | 4.6
Dealer Enrollment Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.7 | 0.9 | 1.1 | 1.8
Dealer Support Products And Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.3 | 0.5 | 0.7 | 1.0
Interest [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.4 | 0.5 | 0.7 | 2.2
Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | $ 0.0 | $ 0.2 | $ 0.2 | $ 0.4

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