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Other income (Schedule of Other Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Other Income | $ 53.1 | $ 49.6 | $ 68.6
Ancillary Product Profit Sharing [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 40.2 | 33.5 | 37.9
Remarketing Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 7.8 | 7.1 | 12.0
Dealer Enrollment Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 1.9 | 3.0 | 4.7
Dealer Support Products And Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 1.3 | 1.9 | 2.5
Interest Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 1.2 | 2.9 | 8.5
GPS-SID Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | 0.0 | 0.0 | 1.9
Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Other Income | $ 0.7 | $ 1.2 | $ 1.1

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of revenue and income classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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