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Other income (Schedule of Other Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Other income $ 16.2 $ 17.1 $ 33.1 $ 32.4
Ancillary Product Profit Sharing [Member]        
Disaggregation of Revenue [Line Items]        
Other income 6.4 9.1 13.7 16.6
Interest [Member]        
Disaggregation of Revenue [Line Items]        
Other income 6.4 4.9 12.2 9.0
Remarketing Fees [Member]        
Disaggregation of Revenue [Line Items]        
Other income 2.9 2.7 6.2 5.7
Other [Member]        
Disaggregation of Revenue [Line Items]        
Other income $ 0.5 $ 0.4 $ 1.0 $ 1.1