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Plant City and Colonsay Closure Costs (Details)
t in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
t
Dec. 31, 2018
USD ($)
Restructuring Cost and Reserve [Line Items]      
Closure costs $ 0.0 $ 871.0 $ 0.0
Plant City      
Restructuring Cost and Reserve [Line Items]      
Closure costs   341.3  
Colonsay      
Restructuring Cost and Reserve [Line Items]      
Closure costs   $ 529.7  
Production Capacity | t   1.5  
2013 Expansion Project Written Off | t   2.1  
Colonsay | Operating Expense      
Restructuring Cost and Reserve [Line Items]      
Closure costs   $ 27.0  
Asset Retirement Obligation Costs | Plant City      
Restructuring Cost and Reserve [Line Items]      
Closure costs   110.0  
Other Current Assets | Plant City      
Restructuring Cost and Reserve [Line Items]      
Closure costs   21.0  
Other Current Assets | Colonsay      
Restructuring Cost and Reserve [Line Items]      
Closure costs   10.0  
Property, Plant and Equipment | Plant City      
Restructuring Cost and Reserve [Line Items]      
Closure costs   210.0  
Property, Plant and Equipment | Colonsay      
Restructuring Cost and Reserve [Line Items]      
Closure costs   $ 493.0