(Loss) Earnings Per Share (Tables)

9 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Computation of basic and diluted (loss) earnings per share

	Three Months Ended June 30,					Nine Months Ended June 30,
	2017			2016		2017		2016
Net (loss) earnings for basic (loss) earnings per share	$	(62.9	)	$	—	$	23.9	$	12.0
Net (loss) earnings for diluted (loss) earnings per share	$	(62.9	)	$	—	$	23.9	$	12.0
Weighted-average shares outstanding	65.9			64.3		64.9		63.7
Effect of TEUs on weighted-average shares for basic (loss) earnings per share	1.6			4.9		3.4		4.9
Weighted-average shares for basic (loss) earnings per share	67.5			69.2		68.3		68.6
Effect of dilutive securities:
Stock options	—			—		1.2		1.1
Stock appreciation rights	—			—		0.1		0.1
Restricted stock awards	—			—		0.2		0.3
Total dilutive securities	—			—		1.5		1.5
Weighted-average shares for diluted (loss) earnings per share	67.5			69.2		69.8		70.1
Basic (loss) earnings per common share	$	(0.93	)	$	—	$	0.35	$	0.17
Diluted (loss) earnings per common share	$	(0.93	)	$	—	$	0.34	$	0.17

Antidilutive Securities Excluded from Computation of (Loss) Earnings Per Share

Antidilutive Securities Excluded from Computation of (Loss) Earnings Per Share

	Three Months Ended June 30,		Nine Months Ended June 30,
	2017	2016	2017	2016
Stock options	4.2	4.2	0.3	0.3
Stock appreciation rights	0.1	0.2	—	—
Restricted stock awards	0.7	0.9	—	0.2
Preferred shares conversion to common	9.1	9.1	9.1	9.1