Earnings (Loss) Per Share of Common Stock - Reconciliation of Numerator and Denominator for Basic and Diluted Earnings (loss) Per Share Calculation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net (loss) available to common stockholders	$ (12.6)	$ (8.8)
Weighted average number of common shares outstanding – basic and diluted	103,307,000	102,502,000
Basic and diluted (loss) per share	$ (0.12)	$ (0.09)
Weighted average number of anti-dilutive options and restricted stock	7,607,000	5,891,000