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Interest Expense, Net
 12 Months Ended
Dec. 31, 2021
Interest Expense [Abstract]  
Interest Expense, Net Interest Expense, Net
Year Ended December 31, (in millions)
202120202019
Interest on long-term debt$336.4 $354.2 $327.7 
Interest on short-term borrowings0.6 14.7 50.8 
Debt discount/cost amortization11.0 9.1 8.3 
Accounts receivable securitization fees1.4 2.6 2.6 
Allowance for borrowed funds used and interest capitalized during construction(4.6)(7.0)(7.5)
Debt-based post-in-service carrying charges(14.7)(14.6)(18.7)
Other11.0 11.7 15.7 
Total Interest Expense, net$341.1 $370.7 $378.9