Earnings Per Share (Tables)

12 Months Ended

Sep. 30, 2023

Earnings Per Share [Abstract]

Computation of basic and diluted earnings per share

	Year Ended September 30,
	2023		2022		2021
Net earnings available to common stockholders for basic earnings per share	$	165.5	$	82.3	$	27.6
Dilutive impact of net earnings attributable to NCI	—		—		0.2
Net earnings available to common stockholders for diluted earnings per share	$	165.5	$	82.3	$	27.8
shares in millions
Weighted-average shares for basic earnings per share	133.0		93.5		39.5
Effect of dilutive securities:
Stock options	0.1		0.1		—
Restricted stock units	0.3		0.2		0.2
Performance-based restricted stock units	0.7		—		—
Weighted-average shares for diluted earnings per share	134.1		93.8		39.7
Basic earnings per share of Common Stock	$	1.24	$	0.88	$	0.70
Diluted earnings per share of Common Stock	$	1.23	$	0.88	$	0.70

Antidilutive securities excluded from computation of earnings per share

	Year Ended September 30,
shares in millions	2023	2022	2021
Stock options	—	—	0.2
Restricted stock units	0.1	0.1	—
Performance-based restricted stock units	0.1	0.1	—