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 |