Earnings per Share (Tables)

12 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]

The following is a reconciliation of the numerator and denominator of the diluted net income per share computations for the periods presented below.

	Year Ended September 30,
(in millions, except share amounts)	2018			2017			2016
Numerator:
Net income	$	55.5		$	6.4		$	54.7
Less: Allocation to participating securities	(0.9		)	(0.1		)	(1.0		)
Net income allocated to common stockholders	$	54.6		$	6.3		$	53.7
Denominator:
Weighted average number of:
Common shares outstanding	18,549,011			18,395,987			18,410,561
Dilutive potential common shares outstanding:
Share-based awards	385,819			291,367			214,811
Diluted shares outstanding	18,934,830			18,687,354			18,625,372