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Other income (Schedule of Other Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Other income	$ 18.9	$ 17.6	$ 58.8	$ 50.7
Ancillary Product Profit Sharing [Member]
Disaggregation of Revenue [Line Items]
Other income	9.5	8.0	25.7	21.7
Interest [Member]
Disaggregation of Revenue [Line Items]
Other income	5.7	6.4	21.9	18.6
Remarketing Fees [Member]
Disaggregation of Revenue [Line Items]
Other income	3.4	2.9	10.1	9.1
Other [Member]
Disaggregation of Revenue [Line Items]
Other income	$ 0.3	$ 0.3	$ 1.1	$ 1.3

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