Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Net income tax benefit, non recurring		$ 1.5		$ 48.0
Cumulative preferred stock dividends undeclared	$ 5.0	5.0	$ 5.0	5.0
Preferred stock dividends declared and paid	$ 1.0	$ 1.0	$ 7.0	$ 1.0