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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Items Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring $ in Millions | Sep. 30, 2020 USD ($)
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Deferred Compensation Plan Assets | $ 38.5
Deferred Compensation Plan Liability | (38.5)
Total | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Deferred Compensation Plan Assets | 38.5
Deferred Compensation Plan Liability | 0.0
Total | 38.5
Significant Other Observable Inputs (Level 2) |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Deferred Compensation Plan Assets | 0.0
Deferred Compensation Plan Liability | (38.5)
Total | (38.5)
Significant Unobservable Inputs (Level 3) |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Deferred Compensation Plan Assets | 0.0
Deferred Compensation Plan Liability | 0.0
Total | $ 0.0

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