Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Items Measured at Fair Value on Recurring Basis (Details)

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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 ($)
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