Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Sales	$ 3,033.9	$ 3,189.3	$ 9,408.7	$ 9,128.6
Segment Total
Disaggregation of Revenue [Line Items]
Sales	$ 3,033.9	$ 3,189.3	$ 9,408.7	$ 9,128.6
Percent sales by supply mode	100.00%	100.00%	100.00%	100.00%
Americas | Segment Total
Disaggregation of Revenue [Line Items]
Sales	$ 1,260.7	$ 1,416.3	$ 4,018.0	$ 3,827.0
Asia | Segment Total
Disaggregation of Revenue [Line Items]
Sales	822.9	751.4	2,414.6	2,283.0
Europe | Segment Total
Disaggregation of Revenue [Line Items]
Sales	706.6	739.6	2,251.4	2,222.4
Middle East and India | Segment Total
Disaggregation of Revenue [Line Items]
Sales	39.7	35.4	125.9	88.0
Corporate and other | Segment Total
Disaggregation of Revenue [Line Items]
Sales	204.0	246.6	598.8	708.2
On-site | Segment Total
Disaggregation of Revenue [Line Items]
Sales	$ 1,438.3	$ 1,646.3	$ 4,663.1	$ 4,742.1
Percent sales by supply mode	47.00%	51.00%	50.00%	52.00%
On-site | Americas | Segment Total
Disaggregation of Revenue [Line Items]
Sales	$ 704.1	$ 899.5	$ 2,351.8	$ 2,432.1
On-site | Asia | Segment Total
Disaggregation of Revenue [Line Items]
Sales	496.8	446.2	1,444.8	1,358.2
On-site | Europe | Segment Total
Disaggregation of Revenue [Line Items]
Sales	220.5	281.8	808.0	899.4
On-site | Middle East and India | Segment Total
Disaggregation of Revenue [Line Items]
Sales	16.9	18.8	58.5	52.4
On-site | Corporate and other | Segment Total
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Merchant | Segment Total
Disaggregation of Revenue [Line Items]
Sales	$ 1,391.6	$ 1,296.4	$ 4,146.8	$ 3,678.3
Percent sales by supply mode	46.00%	41.00%	44.00%	40.00%
Merchant | Americas | Segment Total
Disaggregation of Revenue [Line Items]
Sales	$ 556.6	$ 516.8	$ 1,666.2	$ 1,394.9
Merchant | Asia | Segment Total
Disaggregation of Revenue [Line Items]
Sales	326.1	305.2	969.8	924.8
Merchant | Europe | Segment Total
Disaggregation of Revenue [Line Items]
Sales	486.1	457.8	1,443.4	1,323.0
Merchant | Middle East and India | Segment Total
Disaggregation of Revenue [Line Items]
Sales	22.8	16.6	67.4	35.6
Merchant | Corporate and other | Segment Total
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Sale of Equipment | Segment Total
Disaggregation of Revenue [Line Items]
Sales	$ 204.0	$ 246.6	$ 598.8	$ 708.2
Percent sales by supply mode	7.00%	8.00%	6.00%	8.00%
Sale of Equipment | Americas | Segment Total
Disaggregation of Revenue [Line Items]
Sales	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Sale of Equipment | Asia | Segment Total
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Sale of Equipment | Europe | Segment Total
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Sale of Equipment | Middle East and India | Segment Total
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Sale of Equipment | Corporate and other | Segment Total
Disaggregation of Revenue [Line Items]
Sales	$ 204.0	$ 246.6	$ 598.8	$ 708.2