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
Sep. 30, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 220.2  
Finite-Lived Intangible Assets, Accumulated Amortization (30.1)  
Finite-Lived Intangible Assets, Net 190.1  
Finite-Lived Intangible Liabilities, Gross (70.5)  
Finite-Lived Intangible Liabilities, Accumulated Amortization 4.6  
Finite-Lived Intangible Liabilities, Net (65.9)  
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 77.0  
Finite-Lived Intangible Assets, Accumulated Amortization (2.6)  
Finite-Lived Intangible Assets, Net 74.4  
Technology-Based Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 60.0  
Finite-Lived Intangible Assets, Accumulated Amortization (2.1)  
Finite-Lived Intangible Assets, Net 57.9  
Trademarks and Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 11.0  
Finite-Lived Intangible Assets, Accumulated Amortization (0.7)  
Finite-Lived Intangible Assets, Net 10.3  
Mining Permits [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 72.2 $ 72.2
Finite-Lived Intangible Assets, Accumulated Amortization (24.7) (24.1)
Finite-Lived Intangible Assets, Net $ 47.5 $ 48.1