Restructuring and Other Costs - Schedule of Acquisition, Divestiture and Integration Costs (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Restructuring Cost And Reserve [Line Items]
Acquisition costs			$ 0.4	$ 27.0
Integration costs			13.4	12.0
Divestiture costs				0.2
Other total	$ 8.4	$ 10.5	13.8	39.2
Other Segments [Member]
Restructuring Cost And Reserve [Line Items]
Acquisition costs	0.3	3.0	0.4	27.0
Integration costs	8.1	0.1	13.4	0.2
Divestiture costs		7.4		12.0
Other total	$ 8.4	$ 10.5	$ 13.8	$ 39.2

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460

Name:	us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration