Earnings Per Share (Tables)

9 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

Computation of basic and diluted earnings per share

	Three Months Ended June 30,				Nine Months Ended June 30,
	2021		2020		2021		2020
Net earnings available to Class A Common Stockholders for basic earnings per share	$	9.5	$	3.3	$	17.9	$	13.5
Dilutive impact of net earnings attributable to NCI	0.1		—		0.1		—
Net earnings available to Class A Common Stockholders for diluted earnings per share	$	9.6	$	3.3	$	18.0	$	13.5
Weighted average shares for basic earnings per share (in millions)	39.5		39.4		39.5		39.4
Total dilutive restricted stock units (in millions)	0.2		0.1		0.2		0.1
Weighted average shares for diluted earnings per share (in millions)	39.7		39.5		39.7		39.5
Basic earnings per share of Class A Common Stock	$	0.24	$	0.08	$	0.45	$	0.34
Diluted earnings per share of Class A Common Stock	$	0.24	$	0.08	$	0.45	$	0.34