Retirement Benefits (Schedule of Allocation of Plan Assets, Actual and Target Allocations) (Details) - Defined Benefit Pension Plan [Member]	Sep. 30, 2022	Sep. 30, 2021
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	100.00%	100.00%
United States [Member] | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	29.50%	30.70%
United States [Member] | Equity Securities | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	2.40%	2.50%
United States [Member] | Equity Securities | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	51.20%	51.20%
United States [Member] | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	69.00%	67.70%
United States [Member] | Debt Securities | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	58.80%	58.80%
United States [Member] | Debt Securities | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	87.60%	87.50%
United States [Member] | Other Investment Asset
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	1.50%	1.60%
Target Allocation Ranges	0.00%	0.00%
United States [Member] | Other Investment Asset | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	0.00%	0.00%
United States [Member] | Other Investment Asset | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	0.00%	0.00%
United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	100.00%	100.00%
United Kingdom | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	46.20%	42.30%
United Kingdom | Equity Securities | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	50.00%	50.00%
United Kingdom | Equity Securities | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	90.00%	90.00%
United Kingdom | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	52.30%	57.30%
United Kingdom | Debt Securities | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	45.00%	45.00%
United Kingdom | Debt Securities | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	70.00%	70.00%
United Kingdom | Other Investment Asset
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	1.50%	0.40%
Target Allocation Ranges	0.00%	0.00%
United Kingdom | Other Investment Asset | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	0.00%	0.00%
United Kingdom | Other Investment Asset | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	0.00%	0.00%
Japan
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	100.00%	100.00%
Japan | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	39.90%	40.30%
Japan | Equity Securities | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	36.00%	36.00%
Japan | Equity Securities | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	44.00%	44.00%
Japan | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	60.10%	58.80%
Japan | Debt Securities | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	55.00%	55.00%
Japan | Debt Securities | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	63.00%	63.00%
Japan | Other Investment Asset
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	0.00%	0.90%
Japan | Other Investment Asset | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	0.00%	0.00%
Japan | Other Investment Asset | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	2.00%	2.00%