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FAIR VALUE MEASUREMENTS - Summary of Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Sep. 30, 2022 | Jan. 01, 2022 | Aug. 13, 2021 | Mar. 17, 2021 | Oct. 22, 2019 | Dec. 15, 2016
--- | --- | --- | --- | --- | --- | --- | ---
Senior notes | 4.000% Senior Notes |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Interest rate of debt (percentage) | 4.00% | 4.00% | 4.00% |  | 4.00% |  |
Senior notes | 4.375% Senior Notes |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Interest rate of debt (percentage) | 4.375% | 4.375% | 4.375% | 4.375% |  |  |
Senior notes | 4.500% Senior Notes |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Interest rate of debt (percentage) | 4.50% | 4.50% | 4.50% |  |  | 4.50% |
Senior notes | 5.250% Senior Notes |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Interest rate of debt (percentage) | 5.25% | 5.25% | 5.25% |  |  |  | 5.25%
Carrying Amount | Fair value, inputs, level 1 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Cash equivalents | $ 1.9 | $ 64.3 | $ 1.6 |  |  |  |
Carrying Amount | Fair value, inputs, level 1 | Fair Value, Measurements, Recurring | Investment securities in non-qualified retirement plan assets |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Other | 37.7 | 38.4 | 50.1 |  |  |  |
Carrying Amount | Fair value, inputs, level 3 | Fair Value, Measurements, Recurring | Convertible debt investments |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Other | 91.2 | 117.0 | 191.3 |  |  |  |
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Credit facilities | Revolving loans |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt instruments | 681.5 | 300.5 | 856.5 |  |  |  |
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Credit facilities | Term loans |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt instruments | 962.5 | 975.0 | 660.0 |  |  |  |
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.000% Senior Notes |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt instruments | 500.0 | 500.0 | 500.0 |  |  |  |
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.375% Senior Notes |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt instruments | 400.0 | 400.0 | 400.0 |  |  |  |
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.500% Senior Notes |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt instruments | 450.0 | 450.0 | 450.0 |  |  |  |
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 5.250% Senior Notes |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt instruments | 250.0 | 250.0 | 250.0 |  |  |  |
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Receivables facility |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt instruments | 161.0 | 75.0 | 94.0 |  |  |  |
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Other debt |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt instruments | 3.8 | 12.7 | 20.6 |  |  |  |
Estimated Fair Value | Fair value, inputs, level 1 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Cash equivalents | 1.9 | 64.3 | 1.6 |  |  |  |
Estimated Fair Value | Fair value, inputs, level 1 | Fair Value, Measurements, Recurring | Investment securities in non-qualified retirement plan assets |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Other | 37.7 | 38.4 | 50.1 |  |  |  |
Estimated Fair Value | Fair value, inputs, level 3 | Fair Value, Measurements, Recurring | Convertible debt investments |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Other | 91.2 | 117.0 | 191.3 |  |  |  |
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Credit facilities | Revolving loans |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt instruments | 681.5 | 300.5 | 856.5 |  |  |  |
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Credit facilities | Term loans |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt instruments | 962.5 | 975.0 | 660.0 |  |  |  |
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.000% Senior Notes |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt instruments | 375.6 | 350.6 | 495.0 |  |  |  |
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.375% Senior Notes |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt instruments | 303.0 | 284.0 | 399.0 |  |  |  |
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.500% Senior Notes |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt instruments | 364.5 | 325.7 | 468.6 |  |  |  |
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 5.250% Senior Notes |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt instruments | 236.3 | 230.0 | 256.6 |  |  |  |
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Receivables facility |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt instruments | 161.0 | 75.0 | 94.0 |  |  |  |
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Other debt |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Debt instruments | $ 3.8 | $ 12.7 | $ 20.6 |  |  |  |

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