Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Sales	$ 3,022.7	$ 2,985.5	$ 8,870.4	$ 8,913.1
Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 3,022.7	$ 2,985.5	$ 8,870.4	$ 8,913.1
Percent sales by supply mode	100.00%	100.00%	100.00%	100.00%
Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 1,261.0	$ 1,234.7	$ 3,835.8	$ 3,732.6
Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	810.0	789.6	2,401.2	2,363.1
Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	770.5	693.4	2,195.1	2,092.5
Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	38.3	32.8	103.9	103.9
Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	142.9	235.0	334.4	621.0
On-site | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 1,543.7	$ 1,423.9	$ 4,584.5	$ 4,322.3
Percent sales by supply mode	51.00%	48.00%	52.00%	48.00%
On-site | Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 708.1	$ 680.3	$ 2,181.7	$ 2,089.9
On-site | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	546.2	506.9	1,598.6	1,506.0
On-site | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	265.5	218.3	743.0	672.0
On-site | Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	23.9	18.4	61.2	54.4
On-site | Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Merchant | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 1,336.1	$ 1,326.6	$ 3,951.5	$ 3,969.8
Percent sales by supply mode	44.00%	44.00%	44.00%	45.00%
Merchant | Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 552.9	$ 554.4	$ 1,654.1	$ 1,642.7
Merchant | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	263.8	282.7	802.6	857.1
Merchant | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	505.0	475.1	1,452.1	1,420.5
Merchant | Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	14.4	14.4	42.7	49.5
Merchant | Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Sale of Equipment | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 142.9	$ 235.0	$ 334.4	$ 621.0
Percent sales by supply mode	5.00%	8.00%	4.00%	7.00%
Sale of Equipment | Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Sale of Equipment | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Sale of Equipment | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Sale of Equipment | Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Sale of Equipment | Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 142.9	$ 235.0	$ 334.4	$ 621.0
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%	1.00%