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Other income (Schedule of Other Income) (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 Support Products And Services [Member]    
Disaggregation of Revenue [Line Items]    
Other income 0.7 1.2
Dealer Enrollment Fees [Member]    
Disaggregation of Revenue [Line Items]    
Other income 1.0 1.1
Other [Member]    
Disaggregation of Revenue [Line Items]    
Other income $ 0.5 $ 0.0