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FAIR VALUE MEASUREMENTS - Summary of Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Sep. 30, 2021 | Aug. 13, 2021 | Mar. 17, 2021 | Sep. 30, 2020 | 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 - 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 - 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 | Receivables facility |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 75.0 | 0.0 |  |  |  |  |
Reported Value Measurement | Fair value, inputs, level 2 | Credit Facilities | Revolving loans |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 300.5 | 0.0 |  |  |  |  |
Reported Value Measurement | Fair value, inputs, level 2 | Credit Facilities | Term loans |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 975.0 | 670.0 |  |  |  |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes due 2031 – 4.000% |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 350.6 | 498.8 |  |  |  |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes due 2032 – 4.375% |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 284.0 | 402.0 |  |  |  |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes - 4.500% |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 325.7 | 466.9 |  |  |  |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes due 2026 – 5.250% |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 230.0 | 258.1 |  |  |  |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Receivables facility |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 75.0 | 0.0 |  |  |  |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Credit Facilities | Revolving loans |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 300.5 | 0.0 |  |  |  |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Credit Facilities | Term loans |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 975.0 | 670.0 |  |  |  |  |
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 1 |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Cash equivalents | 64.3 | 222.5 |  |  |  |  |
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 1 | Investment securities in non-qualified retirement plan assets |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Other | 38.4 | 45.0 |  |  |  |  |
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 2 | Other Long-term Debt |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 12.7 | 11.9 |  |  |  |  |
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 3 | Convertible debt investments |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Convertible debt investments | 117.0 | 190.3 |  |  |  |  |
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 3 | Loans receivable |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Other | 32.8 | 35.8 |  |  |  |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 1 |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Cash equivalents | 64.3 | 222.5 |  |  |  |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 1 | Investment securities in non-qualified retirement plan assets |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Other | 38.4 | 45.0 |  |  |  |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Other Long-term Debt |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 12.7 | 11.9 |  |  |  |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 3 | Convertible debt investments |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Convertible debt investments | 117.0 | 190.3 |  |  | $ 0.0 |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 3 | Loans receivable |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Other | $ 32.8 | $ 35.8 |  |  |  |  |

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