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Other Income (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | $ 16.8 | $ 14.2 | $ 45.8 | $ 42.6
Ancillary Product Profit Sharing [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 8.7 | 6.2 | 20.9 | 16.6
Remarketing Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 2.8 | 2.8 | 8.9 | 8.7
GPS-SID Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 1.4 | 2.3 | 5.3 | 9.0
Dealer Support Products And Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 1.0 | 1.2 | 3.4 | 3.7
Dealer Enrollment Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 1.0 | 1.0 | 3.3 | 3.0
Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 1.9 | $ 0.7 | 4.0 | $ 1.6
Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 11.1 |  | 27.8 |
Transferred over Time [Member] | Ancillary Product Profit Sharing [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 8.7 |  | 20.9 |
Transferred over Time [Member] | Remarketing Fees [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] | Dealer Support Products And Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Transferred over Time [Member] | Dealer Enrollment Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 1.0 |  | 3.3 |
Transferred over Time [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 1.4 |  | 3.6 |
Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 5.7 |  | 18.0 |
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 | 2.8 |  | 8.9 |
Transferred at Point in Time [Member] | GPS-SID Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 1.4 |  | 5.3 |
Transferred at Point in Time [Member] | Dealer Support Products And Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 1.0 |  | 3.4 |
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] | Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.5 |  | 0.4 |
Third Party Providers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 12.0 |  | 30.2 |
Third Party Providers [Member] | Ancillary Product Profit Sharing [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 8.7 |  | 20.9 |
Third Party Providers [Member] | Remarketing Fees [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 | 1.4 |  | 5.3 |
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] | Dealer Enrollment Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Third Party Providers [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 1.9 |  | 4.0 |
Dealers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 4.8 |  | 15.6 |
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 | 2.8 |  | 8.9 |
Dealers [Member] | GPS-SID Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 0.0 |  | 0.0 |
Dealers [Member] | Dealer Support Products And Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 1.0 |  | 3.4 |
Dealers [Member] | Dealer Enrollment Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | 1.0 |  | 3.3 |
Dealers [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other income | $ 0.0 |  | $ 0.0 |

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