Income Taxes Deferred Taxes (Details) - USD ($) $ in Millions		Sep. 30, 2020	Sep. 30, 2019
Deferred income tax assets:
Accruals and allowances		$ 5.3	$ 10.7
Employee related accruals and allowances		121.3	125.1
Pension		60.5	96.8
State net operating loss carryforwards, net of federal benefit		67.0	57.6
State credit carryforwards, net of federal benefit		79.4	69.5
Federal and foreign net operating loss carryforwards		188.3	173.5
Restricted stock and options		33.7	39.3
Lease liabilities		179.1
Other		52.8	52.8
Deferred Tax Assets, Gross		787.4	625.3
Deferred income tax liabilities:
Property, plant and equipment		1,885.5	1,840.5
Deductible intangibles and goodwill		841.5	914.7
Inventory reserves		216.2	188.3
Deferred gain		272.2	275.2
Basis difference in joint ventures		33.8	33.1
Right-of-use assets		163.8
Deferred Tax Liabilities, Gross		3,413.0	3,251.8
Valuation allowances		257.5	218.0
Net deferred income tax liability		2,883.1	2,844.5
Long-term deferred tax asset	[1]	33.8	33.5
Long-term deferred tax liability		2,916.9	2,878.0
Net deferred income tax liability		$ 2,883.1	$ 2,844.5

[1] The long-term deferred tax asset is presented in Other assets on the consolidated balance sheets.