Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details)

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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 ($)
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