Earnings per share (Tables)

12 Months Ended

Sep. 30, 2023

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table sets forth the computation of basic and diluted earnings/(loss) per share for the years ended September 30, 2023, 2022 and 2021:

	For the Years Ended September 30,
(in millions, except per share data)	2023		2022		2021
Basic earnings / (loss) per share
Net earnings/(loss)	$	140.5	$	(231.5)	$	160.9
Mandatory preferred stock dividends	—		(4.0)		(16.2)
Net earnings/(loss) attributable to common shareholders	$	140.5	$	(235.5)	$	144.7
Weighted average common shares outstanding - basic	71.5		69.9		68.2
Basic net earnings/(loss) per common share	$	1.97	$	(3.37)	$	2.12
Diluted earnings / (loss) per share
Net earnings/(loss) attributable to common shareholders	$	140.5	$	(235.5)	$	144.7
Weighted average common shares outstanding - basic	71.5		69.9		68.2
Effect of dilutive restricted stock units	0.4		—		0.2
Effect of dilutive performance shares	0.5		—		0.2
Effect of stock based deferred compensation plan	—		—		0.1
Weighted average common shares outstanding - diluted	72.4		69.9		68.7
Diluted net earnings/(loss) per common share	$	1.94	$	(3.37)	$	2.11