Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Sales	$ 2,994.2	$ 2,375.2
Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 2,994.2	$ 2,375.2
Percent sales by supply mode	100.00%	100.00%
Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 1,224.1	$ 933.0
Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	780.4	717.5
Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	744.2	543.5
Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	23.7	19.5
Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	221.8	161.7
On-site | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 1,591.1	$ 1,144.9
Percent sales by supply mode	53.00%	48.00%
On-site | Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 797.6	$ 541.3
On-site | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	451.6	414.9
On-site | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	325.6	176.5
On-site | Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	16.3	12.2
On-site | Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0
Merchant | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 1,181.3	$ 1,068.6
Percent sales by supply mode	40.00%	45.00%
Merchant | Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 426.5	$ 391.7
Merchant | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	328.8	302.6
Merchant | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	418.6	367.0
Merchant | Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	7.4	7.3
Merchant | Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0
Sale of Equipment | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 221.8	$ 161.7
Percent sales by supply mode	7.00%	7.00%
Sale of Equipment | Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 0.0	$ 0.0
Sale of Equipment | Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0
Sale of Equipment | Europe | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0
Sale of Equipment | Middle East and India | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0
Sale of Equipment | Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 221.8	$ 161.7