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ENVIRONMENTAL (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Environmental Remediation Obligations [Abstract]          
Provisions charged to income $ 2.8 $ 22.0 $ 5.4 $ 23.8  
Recoveries for costs incurred and expensed 0.0 (4.8) 0.0 (4.8)  
Environmental expense 2.8 17.2 5.4 19.0  
Revision of remediation estimates resulting from agency action   20.0   20.0  
Reserves for future environmental expenditures - total 138.6 144.4 138.6 144.4 $ 139.0
Reserves for future environmental expenditures - noncurrent $ 121.6 $ 127.4 $ 121.6 $ 127.4 $ 122.0