Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES - Intangible Assets and Liabilities (Details)

v3.20.2
GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES - Intangible Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 220.2  
Finite-Lived Intangible Assets, Accumulated Amortization (27.6)  
Finite-Lived Intangible Assets, Net 192.6  
Finite-Lived Intangible Liabilities, Gross (75.0)  
Finite-Lived Intangible Liabilities, Accumulated Amortization 2.7  
Finite-Lived Intangible Liabilities, Net (72.3)  
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 77.0  
Finite-Lived Intangible Assets, Accumulated Amortization (1.5)  
Finite-Lived Intangible Assets, Net 75.5  
Technology-Based Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 60.0  
Finite-Lived Intangible Assets, Accumulated Amortization (1.2)  
Finite-Lived Intangible Assets, Net 58.8  
Trademarks and Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 11.0  
Finite-Lived Intangible Assets, Accumulated Amortization (0.4)  
Finite-Lived Intangible Assets, Net 10.6  
Mining Permits [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 72.2 $ 72.2
Finite-Lived Intangible Assets, Accumulated Amortization (24.5) (24.1)
Finite-Lived Intangible Assets, Net $ 47.7 $ 48.1