Business Combination Schedule of Business Acquisitions, by Acquisition (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 04, 2017
Assets acquired:
Receivables					$ 6.9
Inventories					17.0
Other current assets					0.2
Property, plant and equipment					8.1
Other non-current assets					1.7
Goodwill		$ 99.8	$ 95.7	$ 12.1
Goodwill					80.4
Tradenames					4.6
Accounts payable and other current liabilities					(5.5)
Other current liabilities					(2.9)
Other non-current liabilities					(1.7)
Consideration paid					140.7
Repayment of Krausz debt		0.0	13.2	0.0
Deferred income tax liability					11.2
Gain (Loss) on Disposition of Property Plant Equipment	$ 9.0	$ 0.0	$ 2.4	$ 9.0
Cash [Member]
Assets acquired:
Disposal Group, Including Discontinued Operation, Consideration						$ 7.4
Prepaid Expenses and Other Current Assets [Member]
Assets acquired:
Disposal Group, Including Discontinued Operation, Prepaid and Other Assets						0.8
Property, Plant and Equipment [Member]
Assets acquired:
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment						0.4
Environmental Remediation [Member]
Assets acquired:
Disposal Group, Including Discontinued Operation, Consideration						$ 1.2
Patents [Member]
Assets acquired:
Patents					32.1
Customer-Related Intangible Assets [Member]
Assets acquired:
Patents					8.7
Above Market Leases [Member]
Assets acquired:
Patents					$ 2.3