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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Fair Value |
Assets and Liabilities: |
Deferred Compensation Plan Assets | $ 35.5
Deferred Compensation Plan Liability | (35.5)
Total assets and liabilities | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) |
Assets and Liabilities: |
Deferred Compensation Plan Assets | 35.5
Deferred Compensation Plan Liability | 0.0
Total assets and liabilities | 35.5
Significant Other Observable Inputs (Level 2) |
Assets and Liabilities: |
Deferred Compensation Plan Assets | 0.0
Deferred Compensation Plan Liability | (35.5)
Total assets and liabilities | (35.5)
Significant Unobservable Inputs (Level 3) |
Assets and Liabilities: |
Deferred Compensation Plan Assets | 0.0
Deferred Compensation Plan Liability | 0.0
Total assets and liabilities | $ 0.0

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