Retirement Benefits (Schedule of Allocation of Plan Assets, Actual and Target Allocations) (Details) - Defined Benefit Pension Plan [Member]	Sep. 30, 2024	Sep. 30, 2023
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	30.50%	31.90%
United States [Member] | Equity Securities | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	2.30%	2.30%
United States [Member] | Equity Securities | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	51.10%	51.20%
United States [Member] | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	67.60%	66.60%
United States [Member] | Debt Securities | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	58.90%	58.80%
United States [Member] | Debt Securities | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	96.70%	96.50%
United States [Member] | Other Investment Asset
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	1.90%	1.50%
United States [Member] | Other Investment Asset | Minimum [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	0.00%	20.70%
United Kingdom | Equity Securities | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	0.00%	10.00%
United Kingdom | Equity Securities | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges		30.00%
United Kingdom | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	95.80%	79.20%
United Kingdom | Debt Securities | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	90.00%	70.00%
United Kingdom | Debt Securities | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	100.00%	90.00%
United Kingdom | Other Investment Asset
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	4.20%	0.10%
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	10.00%
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	39.70%	40.00%
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	59.40%	60.00%
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	0.90%	0.00%
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%