Restructuring and Impairment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges	$ 0.3	$ 0.7	$ 14.3	$ 3.0
Location, Statement of Income, Balance [Axis]: us-gaap:CostOfRevenue
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges		0.5		1.5
Location, Statement of Income, Balance [Axis]: us-gaap:RestructuringSettlementAndImpairmentProvisions
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges		0.2		1.5
Dealership
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges	0.2	0.5	6.3	1.6
Distribution
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges	$ 0.1	$ 0.2	$ 8.0	$ 1.4