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Asset Retirement Obligation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
ASSET RETIREMENT OBLIGATIONS [Abstract]    
Beginning balance $ 10.8 $ 10.2
Accretion Expense 0.9 0.8
Accrued to expense during the year 1.6 0.0
Adjusted to other operating credits and charges (0.8) 0.0
Payments made (0.4) (0.3)
Translation (0.1) 0.1
Ending balance $ 12.0 $ 10.8