Earnings Per Share - SBH - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	12 Months Ended
Sep. 30, 2020	Jun. 30, 2020	Mar. 29, 2020	Dec. 29, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Net Income (Loss) Attributable to Parent [Abstract]
Net income (loss) from continuing operations attributable to controlling interest	$ 43.7	$ 137.1	$ (58.4)	$ (38.6)	$ (79.0)	$ (24.7)	$ (55.0)	$ (29.3)	$ 83.8	$ (188.0)	$ 356.5
Income from discontinued operations attributable to controlling interest	1.7	8.0	1.4	2.8	(16.7)	(1.2)	783.6	(83.2)	14.0	682.5	411.8
Net income attributable to controlling interest	$ 45.4	$ 145.1	$ (57.0)	$ (35.8)	$ (95.7)	$ (25.9)	$ 728.6	$ (112.5)	$ 97.8	$ 494.5	$ 768.3
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted average shares outstanding - basic (in shares)									44.7	50.7	36.9
Dilutive shares (in shares)									0.2	0.0	0.1
Weighted average shares outstanding - diluted (in shares)									44.9	50.7	37.0
Earnings per share
Basic earnings per share from continuing operations (in dollars per share)	$ 1.01	$ 3.19	$ (1.29)	$ (0.81)	$ (1.62)	$ (0.51)	$ (1.06)	$ (0.56)	$ 1.88	$ (3.71)	$ 9.64
Basic earnings per share from discontinued operations (in dollars per share)	0.04	0.18	0.03	0.06	(0.35)	(0.02)	15.13	(1.55)	0.31	13.47	11.15
Basic earnings per share (in dollars per share)	1.05	3.37	(1.26)	(0.75)	(1.97)	(0.53)	14.07	(2.11)	2.19	9.76	20.79
Diluted earnings per share from continuing operations (in dollars per share)	1.01	3.18	(1.29)	(0.81)	(1.62)	(0.51)	(1.06)	(0.56)	1.87	(3.71)	9.62
Diluted earnings per share from discontinued operations (in dollars per share)	0.04	0.18	0.03	0.06	(0.35)	(0.02)	15.13	(1.55)	0.31	13.47	11.12
Diluted earnings per share (in dollars per share)	$ 1.05	$ 3.36	$ (1.26)	$ (0.75)	$ (1.97)	$ (0.53)	$ 14.07	$ (2.11)	$ 2.18	$ 9.76	$ 20.74
Weighted average number of anti-dilutive shares excluded from denominator (in shares)									0.0	0.2	0.0

Earnings Per Share Basic Diluted [Abstract]

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.