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DEBT - Components of Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Aug. 13, 2021	Mar. 17, 2021	Oct. 22, 2019	Dec. 15, 2016
Debt Instrument [Line Items]
Total debt	$ 2,630.6	$ 2,992.1
Finance lease obligations	16.9	28.9
Less current portions	52.3	144.3
Long-term debt	2,557.4	2,826.2
Credit Facilities | Revolving loans
Debt Instrument [Line Items]
Total debt	88.3	300.5
Credit Facilities | Term loans
Debt Instrument [Line Items]
Total debt	925.0	975.0
Senior Notes | Senior Notes due 2031 – 4.000%
Debt Instrument [Line Items]
Total debt	$ 500.0	$ 500.0
Interest rate (percent)	4.00%	4.00%		4.00%
Senior Notes | Senior Notes due 2032 – 4.375%
Debt Instrument [Line Items]
Total debt	$ 400.0	$ 400.0
Interest rate (percent)	4.375%	4.375%	4.375%
Senior Notes | Senior Notes - 4.500%
Debt Instrument [Line Items]
Total debt	$ 450.0	$ 450.0
Interest rate (percent)	4.50%	4.50%			4.50%
Senior Notes | Senior Notes due 2026 – 5.250%
Debt Instrument [Line Items]
Total debt	$ 250.0	$ 250.0
Interest rate (percent)	5.25%	5.25%				5.25%
Receivables facility
Debt Instrument [Line Items]
Total debt	$ 0.0	$ 75.0
Other
Debt Instrument [Line Items]
Total debt	0.4	12.7
Long-term Debt
Debt Instrument [Line Items]
Less unamortized debt issuance costs	$ 20.9	$ 21.6

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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