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Other Commitments And Contingencies (Narrative) (Details)
 3 Months Ended
May 24, 2024
USD ($)
Mar. 18, 2024
USD ($)
Jun. 30, 2024
USD ($)
Rate
Dec. 31, 2023
USD ($)
Other Commitments And Contingencies [Line Items]        
Guaranty Liabilities     $ 921,100,000 $ 646,100,000
Recorded reserves to cover environmental remediation at various sites     $ 87,300,000 80,000,000.0
Wind Power Purchase Agreement, Purchase Percentage | Rate     100.00%  
Payments to Acquire Assets, Investing Activities $ 114.9 $ 110,600,000    
Increase (Decrease) in Other Accrued Liabilities     $ 11,200,000  
MGP Sites        
Other Commitments And Contingencies [Line Items]        
Number of waste disposal sites identified by program     53  
Liability for Estimated Remediation Costs     $ 82,300,000 $ 73,700,000
Reasonably possible remediation costs variance from reserve     16,400,000  
Standby Letters of Credit        
Other Commitments And Contingencies [Line Items]        
Long-term Line of Credit     $ 9,900,000