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Income Taxes (Significant Components of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Sep. 30, 2021
Gross Deferred Tax Assets    
Retirement benefits and compensation accruals $ 77.2 $ 69.4
Tax loss carryforwards 126.3 120.9
Tax credits and other tax carryforwards 39.2 27.3
Reserves and accruals 55.4 74.5
Currency losses 0.0 30.4
Other 68.3 44.0
Valuation allowance (100.1) (97.6)
Deferred Tax Assets 266.3 268.9
Gross Deferred Tax Liabilities    
Plant and equipment 1,187.6 1,171.8
Currency gains 22.5 0.0
Unremitted earnings of foreign entities 72.9 69.1
Partnership and other investments 16.1 15.3
Intangible assets 69.8 86.2
Other 9.1 7.2
Deferred Tax Liabilities 1,378.0 1,349.6
Net Deferred Income Tax Liability $ 1,111.7 $ 1,080.7