v3.25.4

Earnings per share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net (loss)/earnings	$ (3.4)	$ 22.3
Weighted average number of shares outstanding, basic (in shares)	68.4	72.0
Basic net (loss)/earnings per common share (in dollars per share)	$ (0.05)	$ 0.31
Weighted average number of shares outstanding, diluted (in shares)	68.4	73.2
Diluted net (loss)/earnings per common share- continuing operations (in dollars per share)	$ (0.05)	$ 0.30
Performance Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of dilutive performance shares (shares)	0.0	0.7
Restricted Stock Equivalents
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of dilutive performance shares (shares)	0.0	0.5

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