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DEBT - Schedule of Debt (Details) - USD ($) $ in Millions	Sep. 30, 2024	May 23, 2024	Sep. 30, 2023	Sep. 24, 2019	Sep. 20, 2016
Debt Instrument [Line Items]
Obligations under finance leases	$ 81.6
Total debt	577.7		$ 1,573.9
Debt issuance costs	(16.9)		(18.4)
Less current portion	(9.4)		(8.6)
Long-term debt, net of current portion	551.4		1,546.9
3.375% Exchangeable Notes, due June 1, 2029
Debt Instrument [Line Items]
Secured debt	$ 350.0
Stated interest rate	3.375%	3.375%
4.00% Notes, due October 1, 2026
Debt Instrument [Line Items]
Secured debt			$ 448.8
Stated interest rate	4.00%		4.00%		4.00%
5.00% Notes, due October 1, 2029
Debt Instrument [Line Items]
Secured debt	$ 4.9		$ 297.2
Stated interest rate	5.00%		5.00%	5.00%
5.50% Notes, due July 15, 2030
Debt Instrument [Line Items]
Secured debt	$ 13.2		$ 288.5
Stated interest rate	5.50%		5.50%
3.875% Notes, due March 15, 2031
Debt Instrument [Line Items]
Secured debt	$ 128.0		$ 453.0
Stated interest rate	3.875%		3.90%
Obligations under finance leases
Debt Instrument [Line Items]
Stated interest rate	5.40%		5.30%
Obligations under finance leases	$ 81.6		$ 86.4