Retirement Benefits (Schedule of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other non-operating income (expense), net	Other non-operating income (expense), net
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 6.0	$ 10.2
Interest Cost	46.9	26.0
Expected Return on Plan Assets	(43.6)	(59.8)
Prior service cost amortization	0.3	0.3
Actuarial loss amortization	17.8	20.6
Settlements	0.0	0.9
Curtailments	(1.9)	0.0
Other	0.3	0.8
Net periodic (benefit) cost	25.8	(1.0)
U.S. | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2.7	4.6
Interest Cost	32.5	18.4
Expected Return on Plan Assets	(31.8)	(42.1)
Prior service cost amortization	0.3	0.3
Actuarial loss amortization	14.8	16.7
Settlements	0.0	0.9
Curtailments	0.0	0.0
Other	0.0	0.0
Net periodic (benefit) cost	18.5	(1.2)
International | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3.3	5.6
Interest Cost	14.4	7.6
Expected Return on Plan Assets	(11.8)	(17.7)
Prior service cost amortization	0.0	0.0
Actuarial loss amortization	3.0	3.9
Settlements	0.0	0.0
Curtailments	(1.9)	0.0
Other	0.3	0.8
Net periodic (benefit) cost	$ 7.3	$ 0.2