Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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+ Details

Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2020
Related Party Transactions [Abstract]
Due from related parties	$ 0.2		$ 0.2		$ 0.1
Chief Executive Officer [Member]
Related Party Transactions [Abstract]
Payments and fees, related party				$ 0.3
Affiliated Entities [Member]
Related Party Transactions [Abstract]
Purchase of inventories	27.5	$ 14.6	63.9	34.1
Expenses incurred	0.5	0.6	1.6	1.6
Affiliated Entities and Individuals [Member]
Related Party Transactions [Abstract]
Fees received for goods and services	$ 0.4	$ 1.6	1.8	1.9
Payments and fees, related party			$ 0.1	$ 0.4