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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.

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Face amount or stated value per share of common stock.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Acquisitions - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions				12 Months Ended
	Oct. 26, 2020	Mar. 10, 2020	Jul. 13, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Goodwill				$ 1,332.0	$ 1,328.1	$ 1,454.7
Par value (in dollars per share)				$ 0.01	$ 0.01
Upward adjustment			$ 200.0
General and administrative expenses				$ 337.8	$ 354.6	335.8
GPC
Business Acquisition [Line Items]
Goodwill				$ 431.6	$ 430.4	435.9
Omega Sea acquisition
Business Acquisition [Line Items]
Purchase price		$ 16.9
Omega Sea acquisition \| GPC
Business Acquisition [Line Items]
Indefinite lived intangible assets		4.4
Goodwill		$ 8.6
Spectrum Merger
Business Acquisition [Line Items]
Par value (in dollars per share)			$ 0.01
General and administrative expenses						$ 45.9
Armitage \| Subsequent Event
Business Acquisition [Line Items]
Purchase price	$ 187.0