Quarterly report pursuant to Section 13 or 15(d)

DEBT AND CREDIT FACILITIES - Schedule of Extinguishment of Debt (Details)

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DEBT AND CREDIT FACILITIES - Schedule of Extinguishment of Debt (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 12, 2021
Mar. 11, 2021
Mar. 27, 2020
Mar. 13, 2020
Mar. 31, 2021
Mar. 31, 2020
Feb. 11, 2021
Dec. 31, 2020
Extinguishment of Debt [Line Items]                
Debt Extinguished         $ 857.0 $ 740.0    
Common shares, issued (in shares)         506,832,537   20,000,000 506,832,537
(Loss) on Extinguishment         $ (66.0) 3.0    
9.875% 2025 Senior Secured Notes                
Extinguishment of Debt [Line Items]                
Debt Extinguished   $ 322.0     322.0      
(Loss) on Extinguishment         (42.0)      
4.875% 2024 Senior Notes                
Extinguishment of Debt [Line Items]                
Debt Extinguished         395.0      
(Loss) on Extinguishment         (14.0)      
7.625% 2021 AK Senior Notes                
Extinguishment of Debt [Line Items]                
Debt Extinguished     $ 9.0 $ 364.0 34.0 373.0    
(Loss) on Extinguishment         0.0 0.0    
7.50% Senior Secured Notes due July 2023                
Extinguishment of Debt [Line Items]                
Debt Extinguished     $ 56.0 $ 311.0 13.0 367.0    
(Loss) on Extinguishment         0.0 $ 3.0    
6.375% 2025 Senior Notes                
Extinguishment of Debt [Line Items]                
Debt Extinguished         64.0      
(Loss) on Extinguishment         (7.0)      
6.375% 2025 AK Senior Notes                
Extinguishment of Debt [Line Items]                
Debt Extinguished         29.0      
(Loss) on Extinguishment         $ (3.0)      
Senior Notes                
Extinguishment of Debt [Line Items]                
Debt Extinguished $ 535.0