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Income Taxes (Significant Components of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Gross Deferred Tax Assets    
Retirement benefits and compensation accruals $ 69.4 $ 209.0
Tax loss carryforwards 120.9 112.6
Tax credits and other tax carryforwards 27.3 40.3
Reserves and accruals 74.5 67.0
Currency losses 30.4 30.4
Other 44.0 64.6
Valuation allowance (97.6) (95.0)
Deferred Tax Assets 268.9 428.9
Gross Deferred Tax Liabilities    
Plant and equipment 1,171.8 1,110.9
Unremitted earnings of foreign entities 69.1 58.7
Partnership and other investments 15.3 19.3
Intangible assets 86.2 83.6
Other 7.2 3.9
Deferred Tax Liabilities 1,349.6 1,276.4
Net Deferred Income Tax Liability $ 1,080.7 $ 847.5