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Other income (Schedule of Other Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]        
Other income $ 17.6 $ 16.1 $ 50.7 $ 48.5
Ancillary Product Profit Sharing [Member]        
Disaggregation of Revenue [Line Items]        
Other income 8.0 7.8 21.7 24.4
Interest [Member]        
Disaggregation of Revenue [Line Items]        
Other income 6.4 5.3 18.6 14.3
Remarketing Fees [Member]        
Disaggregation of Revenue [Line Items]        
Other income 2.9 2.5 9.1 8.2
Other [Member]        
Disaggregation of Revenue [Line Items]        
Other income $ 0.3 $ 0.5 $ 1.3 $ 1.6