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Other Income (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | $ 16.2 | $ 17.1 | $ 33.1 | $ 32.4
Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 13.0 |  | 26.3 |
Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 3.2 |  | 6.8 |
Third Party Providers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 12.9 |  | 26.1 |
Dealers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 3.3 |  | 7.0 |
Ancillary Product Profit Sharing [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 6.4 | 9.1 | 13.7 | 16.6
Ancillary Product Profit Sharing [Member] | Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 6.4 |  | 13.7 |
Ancillary Product Profit Sharing [Member] | Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Ancillary Product Profit Sharing [Member] | Third Party Providers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 6.4 |  | 13.7 |
Ancillary Product Profit Sharing [Member] | Dealers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Interest [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 6.4 | 4.9 | 12.2 | 9.0
Interest [Member] | Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 6.4 |  | 12.2 |
Interest [Member] | Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Interest [Member] | Third Party Providers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 6.4 |  | 12.2 |
Interest [Member] | Dealers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Remarketing Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 2.9 | 2.7 | 6.2 | 5.7
Remarketing Fees [Member] | Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Remarketing Fees [Member] | Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 2.9 |  | 6.2 |
Remarketing Fees [Member] | Third Party Providers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Remarketing Fees [Member] | Dealers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 2.9 |  | 6.2 |
Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.5 | $ 0.4 | 1.0 | $ 1.1
Other [Member] | Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.2 |  | 0.4 |
Other [Member] | Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.3 |  | 0.6 |
Other [Member] | Third Party Providers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.1 |  | 0.2 |
Other [Member] | Dealers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | $ 0.4 |  | $ 0.8 |

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