Earnings Per Share (Tables)

6 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Computation of basic and diluted earnings per share

	Three Months Ended March 31,				Six Months Ended March 31,
	2021		2020		2021		2020
Net earnings available to Class A Common Stockholders for basic earnings per share	$	0.6	$	4.2	$	8.4	$	10.2
Dilutive impact of net earnings attributable to NCI	—		—		—		—
Net earnings available to Class A Common Stockholders for diluted earnings per share	$	0.6	$	4.2	$	8.4	$	10.2
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		0.1		—
Weighted average shares for diluted earnings per share (in millions)	39.7		39.5		39.6		39.4
Basic earnings per share of Class A Common Stock	$	0.02	$	0.11	$	0.21	$	0.26
Diluted earnings per share of Class A Common Stock	$	0.02	$	0.11	$	0.21	$	0.26