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DEBT - Components of Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024	Aug. 13, 2021	Mar. 17, 2021	Oct. 22, 2019	Dec. 15, 2016
Debt Instrument [Line Items]
Total debt	$ 2,119.7	$ 2,242.8
Finance lease obligations	14.5	17.8
Less current portions	57.2	52.6
Long-term debt	2,049.2	2,174.2
Credit Facilities | Term loans
Debt Instrument [Line Items]
Total debt	500.0	625.0
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 due 2029 - 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%
Other
Debt Instrument [Line Items]
Total debt	$ 5.2	$ 0.0
Long-term Debt
Debt Instrument [Line Items]
Less unamortized debt issuance costs	$ 13.3	$ 16.0

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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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