Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Sales	$ 3,174.7	$ 2,994.2
Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 3,174.7	$ 2,994.2
Percent sales by supply mode	100.00%	100.00%
Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 1,384.2	$ 1,224.1
Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	777.8	780.4
Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	791.9	744.2
Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	41.4	23.7
Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	179.4	221.8
On-site | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 1,650.4	$ 1,591.1
Percent sales by supply mode	52.00%	53.00%
On-site | Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 845.8	$ 797.6
On-site | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	457.7	451.6
On-site | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	328.1	325.6
On-site | Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	18.8	16.3
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	$ 1,344.9	$ 1,181.3
Percent sales by supply mode	42.00%	40.00%
Merchant | Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 538.4	$ 426.5
Merchant | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	320.1	328.8
Merchant | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	463.8	418.6
Merchant | Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	22.6	7.4
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	$ 179.4	$ 221.8
Percent sales by supply mode	6.00%	7.00%
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	$ 179.4	$ 221.8