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Other Income (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | $ 15.9 | $ 16.8 | $ 51.6 | $ 45.8
Ancillary Product Profit Sharing [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 8.8 | 8.7 | 27.3 | 20.9
Remarketing Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 3.0 | 2.8 | 9.5 | 8.9
Interest [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 2.0 | 1.4 | 6.7 | 3.6
Dealer Enrollment Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 1.4 | 1.0 | 3.5 | 3.3
Dealer Support Products And Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.6 | 1.0 | 2.0 | 3.4
GPS-SID Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 | 1.4 | 1.9 | 5.3
Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.1 | $ 0.5 | 0.7 | $ 0.4
Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 12.2 |  | 37.5 |
Transferred over Time [Member] | Ancillary Product Profit Sharing [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 8.8 |  | 27.3 |
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 | 2.0 |  | 6.7 |
Transferred over Time [Member] | Dealer Enrollment Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 1.4 |  | 3.5 |
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] | GPS-SID Fees [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 | 3.7 |  | 14.1 |
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 | 3.0 |  | 9.5 |
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 | 0.6 |  | 2.0 |
Transferred at Point in Time [Member] | GPS-SID Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 1.9 |
Transferred at Point in Time [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.1 |  | 0.7 |
Third Party Providers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 10.9 |  | 36.6 |
Third Party Providers [Member] | Ancillary Product Profit Sharing [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 8.8 |  | 27.3 |
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 | 2.0 |  | 6.7 |
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] | GPS-SID Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 1.9 |
Third Party Providers [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.1 |  | 0.7 |
Dealers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 5.0 |  | 15.0 |
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 | 3.0 |  | 9.5 |
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 | 1.4 |  | 3.5 |
Dealers [Member] | Dealer Support Products And Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.6 |  | 2.0 |
Dealers [Member] | GPS-SID Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Dealers [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | $ 0.0 |  | $ 0.0 |

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