Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Sales	$ 3,161.0	$ 3,022.7	$ 9,435.3	$ 8,870.4
Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 3,161.0	$ 3,022.7	$ 9,435.3	$ 8,870.4
Percent sales by supply mode	100.00%	100.00%	100.00%	100.00%
Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 1,321.4	$ 1,261.0	$ 4,047.0	$ 3,835.8
Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	886.0	810.0	2,550.1	2,401.2
Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	815.7	770.5	2,386.7	2,195.1
Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	34.8	38.3	94.3	103.9
Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	103.1	142.9	357.2	334.4
On-site | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 1,670.9	$ 1,543.7	$ 5,016.5	$ 4,584.5
Percent sales by supply mode	53.00%	51.00%	53.00%	52.00%
On-site | Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 783.1	$ 708.1	$ 2,407.4	$ 2,181.7
On-site | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	594.3	546.2	1,744.8	1,598.6
On-site | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	277.7	265.5	816.3	743.0
On-site | Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	15.8	23.9	48.0	61.2
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	$ 1,387.0	$ 1,336.1	$ 4,061.6	$ 3,951.5
Percent sales by supply mode	44.00%	44.00%	43.00%	44.00%
Merchant | Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 538.3	$ 552.9	$ 1,639.6	$ 1,654.1
Merchant | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	291.7	263.8	805.3	802.6
Merchant | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	538.0	505.0	1,570.4	1,452.1
Merchant | Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	19.0	14.4	46.3	42.7
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	$ 103.1	$ 142.9	$ 357.2	$ 334.4
Percent sales by supply mode	3.00%	5.00%	4.00%	4.00%
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	$ 103.1	$ 142.9	$ 357.2	$ 334.4
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%