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Contingencies (Details)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2018
Party
Nov. 30, 2019
USD ($)
Mar. 31, 2016
Party
mi
Jan. 02, 2021
USD ($)
contaminant
Dec. 28, 2019
USD ($)
Loss Contingencies [Line Items]          
Loss Contingency, Estimate of Possible Loss, Area of Land | mi     8.3    
Loss Contingency, Estimate of Possible Loss       $ 1,380.0  
Loss Contingency, Number of Parties | Party 100   100    
Number of Contaminants | contaminant       8  
Gain (Loss) Related to Litigation Settlement   $ 0.6      
Insurance Environmental and Litigation Matters [Member]          
Loss Contingencies [Line Items]          
Reserves for insurance, environmental and litigation contingencies       $ 66.2 $ 70.5
Insurance Settlements Receivable, Noncurrent       27.0 $ 26.2
Settled Litigation [Member]          
Loss Contingencies [Line Items]          
Loss Contingency, Number of Parties | Party 20        
Pending Litigation [Member]          
Loss Contingencies [Line Items]          
Loss Contingency, Estimate of Possible Loss       $ 165.0  
Loss Contingency, Number of Parties | Party 40        
Plant, One [Member]          
Loss Contingencies [Line Items]          
Gain (Loss) Related to Litigation Settlement   0.3      
Plant, Two [Member]          
Loss Contingencies [Line Items]          
Gain (Loss) Related to Litigation Settlement   $ 0.3