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COMMITMENTS AND CONTINGENCIES (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 02, 2016
lawsuit
Commitments and contingencies      
Future purchase commitments $ 1,104.3 $ 737.3  
Commitments for capital expenditures $ 186.6 $ 101.9  
CMM | Other regulatory matters      
Commitments and contingencies      
Number of lawsuits | lawsuit     2