Summary of Significant Accounting Policies (Inventories) (Details) - USD ($)	Sep. 30, 2021	Sep. 30, 2020
Inventory, Net [Abstract]
Inventory, Finished Goods, Net of Reserves	$ 153.7	$ 167,600,000
Inventory, Work in Process, Net of Reserves	53.3	48,400,000
Inventory, Raw Materials, Net of Reserves	112.4	136,000,000.0
Total	319.4	$ 352,000,000.0
Change in Accounting Method Accounted for as Change in Estimate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
LIFO Inventory Amount	$ (6,800,000)

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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The amount of LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

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