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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, plant and equipment (Details)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
segments
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Property, plant and equipment      
Property, plant and equipment, at cost $ 595.7 $ 592.5 $ 556.4
Less: Accumulated depreciation (188.6) (164.3) (114.7)
Property, plant and equipment, net $ 407.1 $ 428.2 441.7
Number of operating segment 3 1  
Machinery and equipment      
Property, plant and equipment      
Property, plant and equipment, at cost $ 292.2 $ 280.7 254.8
Machinery and equipment | Minimum      
Property, plant and equipment      
Property, plant and equipment, useful life   10 years  
Machinery and equipment | Maximum      
Property, plant and equipment      
Property, plant and equipment, useful life   12 years  
Building      
Property, plant and equipment      
Property, plant and equipment, at cost 247.9 $ 243.2 234.0
Building | Minimum      
Property, plant and equipment      
Property, plant and equipment, useful life   30 years  
Building | Maximum      
Property, plant and equipment      
Property, plant and equipment, useful life   40 years  
Land      
Property, plant and equipment      
Property, plant and equipment, at cost 46.2 $ 46.7 51.7
Construction in progress      
Property, plant and equipment      
Property, plant and equipment, at cost $ 9.4 $ 21.9 $ 15.9