Financial Instruments (Interest Rate Management Contracts and Cross Currency Interest Rate Swaps) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Interest rate swaps contracts | Designated as Hedging Instrument | Fair value hedges
Derivative [Line Items]
US$ Notional	$ 800.0	$ 200.0
Average Pay %	Various	LIBOR
Average Receive %	1.64%	2.76%
Years Average Maturity	5 years	1 month 6 days
Cross currency interest rate swaps | Designated as Hedging Instrument | Net investment hedges
Derivative [Line Items]
US$ Notional	$ 176.7	$ 210.2
Average Pay %	4.12%	4.32%
Average Receive %	3.07%	3.14%
Years Average Maturity	1 year 2 months 12 days	2 years 2 months 12 days
Cross currency interest rate swaps | Designated as Hedging Instrument | Cash flow hedges
Derivative [Line Items]
US$ Notional	$ 785.7	$ 1,005.7
Average Pay %	4.78%	4.98%
Average Receive %	3.05%	2.93%
Years Average Maturity	2 years 3 months 18 days	2 years 8 months 12 days
Cross currency interest rate swaps | Not Designated as Hedging Instrument
Derivative [Line Items]
US$ Notional	$ 37.7	$ 4.2
Average Pay %	5.39%	5.39%
Average Receive %	3.54%	3.54%
Years Average Maturity	1 year 2 months 12 days	2 years 2 months 12 days