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Commitments and Contingencies - Loss Contingency (Details)
$ in Millions
3 Months Ended
Feb. 15, 2019
plaintiff
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Aug. 12, 2019
complaint
Loss Contingencies [Line Items]        
Accrual for litigation, other Disputes and environmental loss contingencies   $ 16.7 $ 16.2  
Proceeds from income tax refunds   33.0    
Excise tax refund receivable, noncurrent   14.0    
Number Of Derivative Complaints | complaint       3
Guarantor obligations, maximum undiscounted exposure   49.4 37.7  
Stockholder complaint        
Loss Contingencies [Line Items]        
Number of plaintiffs | plaintiff 2      
Kaiser Tax, Civil and Labor Indemnity Reserve        
Loss Contingencies [Line Items]        
Loss contingency accrual   10.2 $ 14.2  
Maximum | Kaiser purchased tax credits indemnity reserve, category two        
Loss Contingencies [Line Items]        
Loss contingency, estimate of possible loss   $ 62.4