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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