Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2019	Sep. 30, 2018
Receivables [Abstract]
Trade receivables	$ 24.5	$ 17.8
Less: long-term receivable recorded in other assets	(1.5)	(2.2)
Finance lease receivables	1.5
Receivables from affiliate	0.4
Other receivables	0.2	0.1
Allowance for doubtful accounts	(0.9)	(1.4)
Total accounts receivable, net	$ 24.2	$ 14.3