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FAIR VALUE MEASUREMENTS - Summary of Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Aug. 13, 2021 | Mar. 17, 2021 | Sep. 30, 2020 | Oct. 22, 2019 | Dec. 15, 2016
--- | --- | --- | --- | --- | --- | ---
Senior Notes | Senior Notes – 4.000% |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Interest rate (percent) | 4.00% |  | 4.00% | 4.00% |  |
Senior Notes | Senior Notes – 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 – 5.250% |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Interest rate (percent) | 5.25% |  |  | 5.25% |  | 5.25%
Reported Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes – 4.000% |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Long-term debt | $ 500.0 |  |  | $ 0.0 |  |
Reported Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes – 4.375% |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Long-term debt | 400.0 |  |  | 0.0 |  |
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 – 5.250% |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Long-term debt | 250.0 |  |  | 250.0 |  |
Reported Value Measurement | Fair value, inputs, level 2 | Receivables facility |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Long-term debt | 0.0 |  |  | 20.0 |  |
Reported Value Measurement | Fair value, inputs, level 2 | Credit Facilities | Revolving loans |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Long-term debt | 0.0 |  |  | 64.0 |  |
Reported Value Measurement | Fair value, inputs, level 2 | Credit Facilities | Term loans |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Long-term debt | 670.0 |  |  | 710.0 |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes – 4.000% |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Long-term debt | 498.8 |  |  | 0.0 |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes – 4.375% |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Long-term debt | 402.0 |  |  | 0.0 |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes - 4.500% |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Long-term debt | 466.9 |  |  | 476.4 |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes – 5.250% |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Long-term debt | 258.1 |  |  | 266.6 |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Receivables facility |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Long-term debt | 0.0 |  |  | 20.0 |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Credit Facilities | Revolving loans |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Long-term debt | 0.0 |  |  | 64.0 |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Credit Facilities | Term loans |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Long-term debt | 670.0 |  |  | 710.0 |  |
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 1 |  |  |  |  |  |
Assets |  |  |  |  |  |
Cash equivalents | 222.5 |  |  | 2.4 |  |
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 1 | Investment securities in non-qualified retirement plan assets |  |  |  |  |  |
Assets |  |  |  |  |  |
Other | 45.0 |  |  | 29.8 |  |
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 2 | Other Long-term Debt |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Long-term debt | 11.9 |  |  | 1.1 |  |
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 3 | Convertible debt investments |  |  |  |  |  |
Assets |  |  |  |  |  |
Convertible debt investments | 190.3 |  |  | 0.0 |  |
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 3 | Bonnie Option |  |  |  |  |  |
Assets |  |  |  |  |  |
Other | 0.0 |  |  | 23.3 |  |
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 3 | Loans receivable |  |  |  |  |  |
Assets |  |  |  |  |  |
Other | 35.8 |  |  | 100.0 |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 1 |  |  |  |  |  |
Assets |  |  |  |  |  |
Cash equivalents | 222.5 |  |  | 2.4 |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 1 | Investment securities in non-qualified retirement plan assets |  |  |  |  |  |
Assets |  |  |  |  |  |
Other | 45.0 |  |  | 29.8 |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Other Long-term Debt |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Long-term debt | 11.9 |  |  | 1.1 |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 3 | Convertible debt investments |  |  |  |  |  |
Assets |  |  |  |  |  |
Convertible debt investments | 190.3 |  |  | 0.0 |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 3 | Bonnie Option |  |  |  |  |  |
Assets |  |  |  |  |  |
Other | 0.0 |  |  | 23.3 |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 3 | Loans receivable |  |  |  |  |  |
Assets |  |  |  |  |  |
Other | $ 35.8 |  |  | $ 112.8 |  |

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