Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Sales	$ 3,189.3	$ 2,604.7	$ 9,128.6	$ 7,481.9
Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 3,189.3	$ 2,604.7	$ 9,128.6	$ 7,481.9
Percent sales by supply mode	100.00%	100.00%	100.00%	100.00%
Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 1,416.3	$ 1,063.3	$ 3,827.0	$ 3,052.4
Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	751.4	751.8	2,283.0	2,166.8
Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	739.6	599.4	2,222.4	1,701.3
Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	35.4	23.9	88.0	69.6
Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	246.6	166.3	708.2	491.8
On-site | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 1,646.3	$ 1,272.8	$ 4,742.1	$ 3,672.7
Percent sales by supply mode	51.00%	49.00%	52.00%	49.00%
On-site | Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 899.5	$ 607.9	$ 2,432.1	$ 1,785.9
On-site | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	446.2	442.8	1,358.2	1,273.7
On-site | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	281.8	205.0	899.4	564.2
On-site | Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	18.8	17.1	52.4	48.9
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	$ 1,296.4	$ 1,165.6	$ 3,678.3	$ 3,317.4
Percent sales by supply mode	41.00%	45.00%	40.00%	44.00%
Merchant | Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 516.8	$ 455.4	$ 1,394.9	$ 1,266.5
Merchant | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	305.2	309.0	924.8	893.1
Merchant | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	457.8	394.4	1,323.0	1,137.1
Merchant | Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	16.6	6.8	35.6	20.7
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	$ 246.6	$ 166.3	$ 708.2	$ 491.8
Percent sales by supply mode	8.00%	6.00%	8.00%	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	$ 246.6	$ 166.3	$ 708.2	$ 491.8