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ACCOUNTING POLICIES (Details 3) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Asset retirement obligation [Roll Forward]    
Beginning balance $ 60.2 $ 54.3
Accretion 3.4 3.2
Spending (4.5) (8.0)
Foreign currency translation adjustments 0.1 (0.2)
Adjustments 4.5 10.9
Ending balance $ 63.7 $ 60.2