Earnings per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3.8	0.2	3.8	0.7
Net (Loss) Earnings before Equity in Subsidiaries	$ (35.1)
Net (loss) earnings	(35.1)	3.4	(55.8)	16.1
Preferred stock dividends	4.2	2.3	11.1	3.1
Net (Loss) Earnings Available to Common Stockholders	$ (39.3)	$ 1.1	$ (66.9)	$ 13.0
Weighted-average shares for basic earnings per share	42.6	32.7	36.3	32.6
Stock appreciation rights	0	0.5	0	0.3
Weighted-average shares for diluted earnings per share	42.6	33.2	36.3	32.9
Basic earnings per share (in usd per share)	$ (0.92)	$ 0.03	$ (1.84)	$ 0.40
Diluted earnings per share (in usd per share)	$ (0.92)	$ 0.03	$ (1.84)	$ 0.40
Employee Stock Option [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Stock appreciation rights	0	0.2	0	0.1
Stock Appreciation Rights (SARs) [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Stock appreciation rights	0	0.1	0	0.1
Restricted Stock [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Stock appreciation rights	0	0.2	0	0.1
Preferred Stock [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	11.0			5.1