Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Items Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring
$ in Millions
Jun. 30, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Deferred Compensation Plan Assets $ 35.8
Deferred Compensation Plan Liability (35.8)
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 35.8
Deferred Compensation Plan Liability 0.0
Total 35.8
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 (35.8)
Total (35.8)
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