EARNINGS PER SHARE - SBH (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Numerator
Net income (loss) from continuing operations attributable to controlling interest	$ 99.3	$ (233.8)	$ (77.2)
Net income from discontinued operations attributable to controlling interest	25.5	2,035.3	148.8
Net income attributable to controlling interest	$ 124.8	$ 1,801.5	$ 71.6
Denominator
Weighted average shares outstanding - basic (in shares)	30.3	39.5	40.9
Dilutive shares (in shares)	0.2	0.0	0.0
Weighted average shares outstanding - diluted (in shares)	30.5	39.5	40.9
Earnings per share
Basic earnings per share from continuing operations (in dollars per share)	$ 3.28	$ (5.92)	$ (1.89)
Basic earnings per share from discontinued operations (in dollars per share)	0.84	51.57	3.64
Basic earnings per share (in dollars per share)	4.12	45.65	1.75
Diluted earnings per share from continuing operations (in dollars per share)	3.26	(5.92)	(1.89)
Diluted earnings per share from discontinued operations (in dollars per share)	0.84	51.57	3.64
Diluted earnings per share (in dollars per share)	$ 4.10	$ 45.65	$ 1.75
Weighted average number of anti-dilutive shares excluded from denominator (in shares)	0.0	0.2	0.2