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FAIR VALUE MEASUREMENTS - Summary of Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Aug. 13, 2021	Mar. 17, 2021	Oct. 22, 2019	Dec. 15, 2016
Senior Notes | Senior Notes due 2031 – 4.000%
Liabilities
Interest rate (percent)	4.00%	4.00%			4.00%
Senior Notes | Senior Notes due 2032 – 4.375%
Liabilities
Interest rate (percent)	4.375%	4.375%		4.375%
Senior Notes | Senior Notes due 2029 - 4.500%
Liabilities
Interest rate (percent)	4.50%	4.50%				4.50%
Senior Notes | Senior Notes due 2026 – 5.250%
Liabilities
Interest rate (percent)	5.25%	5.25%					5.25%
Reported Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes due 2031 – 4.000%
Liabilities
Long-term debt	$ 500.0	$ 500.0
Reported Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes due 2032 – 4.375%
Liabilities
Long-term debt	400.0	400.0
Reported Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes due 2029 - 4.500%
Liabilities
Long-term debt	450.0	450.0
Reported Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes due 2026 – 5.250%
Liabilities
Long-term debt	250.0	250.0
Reported Value Measurement | Fair value, inputs, level 2 | Credit Facilities | Term loans
Liabilities
Long-term debt	500.0	625.0
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes due 2031 – 4.000%
Liabilities
Long-term debt	459.4	456.3
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes due 2032 – 4.375%
Liabilities
Long-term debt	367.0	370.0
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes due 2029 - 4.500%
Liabilities
Long-term debt	437.1	432.0
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes due 2026 – 5.250%
Liabilities
Long-term debt	249.4	248.8
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Credit Facilities | Term loans
Liabilities
Long-term debt	500.0	625.0
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 1
Assets
Cash equivalents	25.3	51.2
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 1 | Investment securities in non-qualified retirement plan assets
Assets
Other	32.6	32.4
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 2 | Other Long-term Debt
Liabilities
Long-term debt	5.2	0.0
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 3 | Convertible debt investments
Assets
Convertible debt investments	24.6	45.8
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 1
Assets
Cash equivalents	25.3	51.2
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 1 | Investment securities in non-qualified retirement plan assets
Assets
Other	32.6	32.4
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Other Long-term Debt
Liabilities
Long-term debt	5.2	0.0
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 3 | Convertible debt investments
Assets
Convertible debt investments	$ 24.6	$ 45.8	$ 85.8

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