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Interest Expense, Net (Tables)
12 Months Ended
Dec. 31, 2020
Interest Expense [Abstract]  
Schedule Of Interest Expense, Net
Year Ended December 31, (in millions)
202020192018
Interest on long-term debt$354.2 $327.7 $342.2 
Interest on short-term borrowings14.7 50.8 31.8 
Debt discount/cost amortization9.1 8.3 7.7 
Accounts receivable securitization fees2.6 2.6 2.6 
Allowance for borrowed funds used and interest capitalized during construction(7.0)(7.5)(9.1)
Debt-based post-in-service carrying charges(14.6)(18.7)(35.0)
Other11.7 15.7 13.1 
Total Interest Expense, net$370.7 $378.9 $353.3