Supplemental Balance Sheet Information - Property, Plant and Equipment by Geographic Area (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Property, Plant, and Equipment
Property, plant and equipment, net	$ 958.7	$ 818.3
Operating lease assets	298.6	266.5
United States
Property, Plant, and Equipment
Property, plant and equipment, net	909.1	774.4
Operating lease assets	281.6	247.2
Non-U.S.
Property, Plant, and Equipment
Property, plant and equipment, net	49.6	43.9
Operating lease assets	$ 17.0	$ 19.3