Annual report pursuant to Section 13 and 15(d)

LEASE OBLIGATIONS (Narrative) (Details)

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LEASE OBLIGATIONS (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Leased Assets [Line Items]      
Capital Leased Assets, Gross $ 37.4 $ 29.3  
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation 21.0 13.1  
Operating lease expense $ 7.1 $ 7.6 $ 12.0