Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Sales	$ 2,997.4	$ 3,174.7
Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 2,997.4	$ 3,174.7
Percent sales by supply mode	100.00%	100.00%
Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 1,252.1	$ 1,384.2
Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	793.8	777.8
Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	731.2	791.9
Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	35.4	41.4
Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	184.9	179.4
On-site | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 1,494.0	$ 1,650.4
Percent sales by supply mode	50.00%	52.00%
On-site | Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 714.1	$ 845.8
On-site | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	503.2	457.7
On-site | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	259.2	328.1
On-site | Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	17.5	18.8
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	$ 1,318.5	$ 1,344.9
Percent sales by supply mode	44.00%	42.00%
Merchant | Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 538.0	$ 538.4
Merchant | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	290.6	320.1
Merchant | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	472.0	463.8
Merchant | Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	17.9	22.6
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	$ 184.9	$ 179.4
Percent sales by supply mode	6.00%	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	$ 184.9	$ 179.4