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Other Income (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Other income | $ 19.7 | $ 15.0
Ancillary Product Profit Sharing [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 10.4 | 6.4
Remarketing Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 3.4 | 3.1
Interest [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 2.3 | 0.7
GPS-SID Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 1.4 | 2.5
Dealer Enrollment Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 1.0 | 1.1
Dealer Support Products And Services [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 0.7 | 1.2
Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 0.5 | $ 0.0
Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 13.7 |
Transferred over Time [Member] | Ancillary Product Profit Sharing [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 10.4 |
Transferred over Time [Member] | Remarketing Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 0.0 |
Transferred over Time [Member] | Interest [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 2.3 |
Transferred over Time [Member] | GPS-SID Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 0.0 |
Transferred over Time [Member] | Dealer Enrollment Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 1.0 |
Transferred over Time [Member] | Dealer Support Products And Services [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 0.0 |
Transferred over Time [Member] | Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 0.0 |
Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 6.0 |
Transferred at Point in Time [Member] | Ancillary Product Profit Sharing [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 0.0 |
Transferred at Point in Time [Member] | Remarketing Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 3.4 |
Transferred at Point in Time [Member] | Interest [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 0.0 |
Transferred at Point in Time [Member] | GPS-SID Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 1.4 |
Transferred at Point in Time [Member] | Dealer Enrollment Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 0.0 |
Transferred at Point in Time [Member] | Dealer Support Products And Services [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 0.7 |
Transferred at Point in Time [Member] | Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 0.5 |
Third Party Providers [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 14.6 |
Third Party Providers [Member] | Ancillary Product Profit Sharing [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 10.4 |
Third Party Providers [Member] | Remarketing Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 0.0 |
Third Party Providers [Member] | Interest [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 2.3 |
Third Party Providers [Member] | GPS-SID Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 1.4 |
Third Party Providers [Member] | Dealer Enrollment Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 0.0 |
Third Party Providers [Member] | Dealer Support Products And Services [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 0.0 |
Third Party Providers [Member] | Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 0.5 |
Dealers [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 5.1 |
Dealers [Member] | Ancillary Product Profit Sharing [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 0.0 |
Dealers [Member] | Remarketing Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 3.4 |
Dealers [Member] | Interest [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 0.0 |
Dealers [Member] | GPS-SID Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 0.0 |
Dealers [Member] | Dealer Enrollment Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 1.0 |
Dealers [Member] | Dealer Support Products And Services [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | 0.7 |
Dealers [Member] | Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Other income | $ 0.0 |

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