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Pension Benefit Obligations - Schedule of Components of Net Periodic Cost for Pension Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Service costs $ 0.0 $ 0.0 $ 0.0 $ 0.0
Interest cost on projected benefit obligation 2.0 2.4 5.9 7.3
Expected return on plan assets (1.2) (1.3) (3.6) (4.1)
Amortization of prior service cost 0.0 0.0 0.0 0.0
Amortization of net loss (gain) 0.9 0.8 2.8 2.3
Net periodic benefit cost (credit) $ 1.7 $ 1.9 $ 5.1 $ 5.5
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration] Other income (loss) Other income (loss) Other income (loss) Other income (loss)
Int’l        
Defined Benefit Plan Disclosure [Line Items]        
Service costs $ 0.0 $ 0.1 $ 0.1 $ 0.2
Interest cost on projected benefit obligation 10.2 10.8 29.7 32.4
Expected return on plan assets (13.3) (14.3) (38.6) (42.6)
Amortization of prior service cost 0.1 0.1 0.1 0.1
Amortization of net loss (gain) (0.4) (0.6) (1.0) (1.8)
Net periodic benefit cost (credit) $ (3.4) $ (3.9) $ (9.7) $ (11.7)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration] Other income (loss) Other income (loss) Other income (loss) Other income (loss)