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Income Taxes (Significant Components of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Gross Deferred Tax Assets    
Retirement benefits and compensation accruals $ 227.1 $ 153.1
Tax loss carryforwards 140.6 143.5
Tax credits and other tax carryforwards 31.1 17.1
Reserves and accruals 69.6 42.5
Currency losses 0.0 3.8
Other 57.7 45.4
Valuation allowance (92.1) (105.0)
Deferred Tax Assets 434.0 300.4
Gross Deferred Tax Liabilities    
Plant and equipment 954.6 811.8
Currency gains 23.9 0.0
Unremitted earnings of foreign entities 31.0 36.1
Partnership and other investments 14.8 16.3
Intangible assets 80.0 84.3
Other 8.3 5.6
Deferred Tax Liabilities 1,112.6 954.1
Net Deferred Income Tax Liability $ 678.6 $ 653.7