Supplemental Balance Sheet Information - Property, Plant and Equipment by Geographic Area (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Property, Plant, and Equipment
Property, plant and equipment, net	$ 818.3	$ 668.6
Operating lease assets	266.5	248.1
United States
Property, Plant, and Equipment
Property, plant and equipment, net	774.4	647.7
Operating lease assets	247.2	229.0
Non-U.S.
Property, Plant, and Equipment
Property, plant and equipment, net	43.9	20.9
Operating lease assets	$ 19.3	$ 19.1