Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Sales	$ 2,931.5	$ 2,997.4
Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 2,931.5	$ 2,997.4
Percent sales by supply mode	100.00%	100.00%
Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 1,287.6	$ 1,252.1
Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	817.1	793.8
Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	697.2	731.2
Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	32.8	35.4
Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	96.8	184.9
On-site | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 1,488.3	$ 1,494.0
Percent sales by supply mode	51.00%	50.00%
On-site | Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 713.1	$ 714.1
On-site | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	529.3	503.2
On-site | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	228.3	259.2
On-site | Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	17.6	17.5
On-site | Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0
Merchant | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 1,346.4	$ 1,318.5
Percent sales by supply mode	46.00%	44.00%
Merchant | Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 574.5	$ 538.0
Merchant | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	287.8	290.6
Merchant | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	468.9	472.0
Merchant | Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	15.2	17.9
Merchant | Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0
Sale of Equipment | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 96.8	$ 184.9
Percent sales by supply mode	3.00%	6.00%
Sale of Equipment | Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 0.0	$ 0.0
Sale of Equipment | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0
Sale of Equipment | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0
Sale of Equipment | Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0
Sale of Equipment | Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 96.8	$ 184.9
Financing And Lease Arrangment | Revenue Benchmark | Revenue Source Concentration Risk
Disaggregation of Revenue [Line Items]
Interest income associated with financing and lease arrangements as a percentage of total consolidated sales	1.00%