DEBT - Schedule of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Obligations under finance leases	$ 82.3	$ 86.4
Total debt	578.4	1,573.9
Debt issuance costs	(17.9)	(18.4)
Less current portion	(9.1)	(8.6)
Long-term debt, net of current portion	$ 551.4	$ 1,546.9
Stated rate	5.30%	5.30%
3.375 % Exchangeable Notes, Due June 1, 2029
Debt Instrument [Line Items]
Convertible debt	$ 350.0
Stated rate	3.375%
4.00% Notes, due October 1, 2026
Debt Instrument [Line Items]
Senior notes		$ 448.8
Stated rate	4.00%	4.00%
5.00% Notes, due October 1, 2029
Debt Instrument [Line Items]
Senior notes	$ 4.9	$ 297.2
Stated rate	5.00%	5.00%
5.50% Notes, due July 15, 2030
Debt Instrument [Line Items]
Senior notes	$ 13.2	$ 288.5
Stated rate	5.50%	5.50%
3.875% Notes, due March 15, 2031
Debt Instrument [Line Items]
Senior notes	$ 128.0	$ 453.0
Stated rate	3.875%	3.90%

Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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