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Other Income (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | $ 16.0 | $ 14.0 | $ 35.7 | $ 29.0
Ancillary Product Profit Sharing [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 8.1 | 5.8 | 18.5 | 12.2
Remarketing Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 3.1 | 3.0 | 6.5 | 6.1
Interest [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 2.4 | 1.4 | 4.7 | 2.1
Dealer Enrollment Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 1.1 | 1.2 | 2.1 | 2.3
Dealer Support Products And Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.7 | 1.2 | 1.4 | 2.4
GPS-SID Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.5 | 1.4 | 1.9 | 3.9
Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.1 | $ 0.0 | 0.6 | $ 0.0
Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 11.6 |  | 25.3 |
Transferred over Time [Member] | Ancillary Product Profit Sharing [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 8.1 |  | 18.5 |
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 | 2.4 |  | 4.7 |
Transferred over Time [Member] | Dealer Enrollment Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 1.1 |  | 2.1 |
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 | 4.4 |  | 10.4 |
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 | 3.1 |  | 6.5 |
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 | 0.7 |  | 1.4 |
Transferred at Point in Time [Member] | GPS-SID Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.5 |  | 1.9 |
Transferred at Point in Time [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.1 |  | 0.6 |
Third Party Providers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 11.1 |  | 25.7 |
Third Party Providers [Member] | Ancillary Product Profit Sharing [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 8.1 |  | 18.5 |
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 | 2.4 |  | 4.7 |
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 | 0.5 |  | 1.9 |
Third Party Providers [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.1 |  | 0.6 |
Dealers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 4.9 |  | 10.0 |
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 | 3.1 |  | 6.5 |
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 | 1.1 |  | 2.1 |
Dealers [Member] | Dealer Support Products And Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.7 |  | 1.4 |
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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