Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Sales	$ 3,200.1	$ 2,945.1	$ 6,374.8	$ 5,939.3
Segment Total
Disaggregation of Revenue [Line Items]
Sales	$ 3,200.1	$ 2,945.1	$ 6,374.8	$ 5,939.3
Percent sales by supply mode	100.00%	100.00%	100.00%	100.00%
Americas | Segment Total
Disaggregation of Revenue [Line Items]
Sales	$ 1,373.1	$ 1,186.6	$ 2,757.3	$ 2,410.7
Asia | Segment Total
Disaggregation of Revenue [Line Items]
Sales	813.9	751.2	1,591.7	1,531.6
Europe | Segment Total
Disaggregation of Revenue [Line Items]
Sales	752.9	738.6	1,544.8	1,482.8
Middle East and India | Segment Total
Disaggregation of Revenue [Line Items]
Sales	44.8	28.9	86.2	52.6
Corporate and other | Segment Total
Disaggregation of Revenue [Line Items]
Sales	215.4	239.8	394.8	461.6
On-site | Segment Total
Disaggregation of Revenue [Line Items]
Sales	$ 1,574.4	$ 1,486.2	$ 3,224.8	$ 3,077.3
Percent sales by supply mode	49.00%	51.00%	51.00%	52.00%
On-site | Americas | Segment Total
Disaggregation of Revenue [Line Items]
Sales	$ 801.9	$ 716.5	$ 1,647.7	$ 1,514.1
On-site | Asia | Segment Total
Disaggregation of Revenue [Line Items]
Sales	490.3	460.4	948.0	912.0
On-site | Europe | Segment Total
Disaggregation of Revenue [Line Items]
Sales	259.4	292.0	587.5	617.6
On-site | Middle East and India | Segment Total
Disaggregation of Revenue [Line Items]
Sales	22.8	17.3	41.6	33.6
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	$ 1,410.3	$ 1,219.1	$ 2,755.2	$ 2,400.4
Percent sales by supply mode	44.00%	41.00%	43.00%	40.00%
Merchant | Americas | Segment Total
Disaggregation of Revenue [Line Items]
Sales	$ 571.2	$ 470.1	$ 1,109.6	$ 896.6
Merchant | Asia | Segment Total
Disaggregation of Revenue [Line Items]
Sales	323.6	290.8	643.7	619.6
Merchant | Europe | Segment Total
Disaggregation of Revenue [Line Items]
Sales	493.5	446.6	957.3	865.2
Merchant | Middle East and India | Segment Total
Disaggregation of Revenue [Line Items]
Sales	22.0	11.6	44.6	19.0
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	$ 215.4	$ 239.8	$ 394.8	$ 461.6
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	$ 215.4	$ 239.8	$ 394.8	$ 461.6