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Interest Expense, Net (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Interest Expense [Abstract]      
Interest on long-term debt $ 354.2 $ 327.7 $ 342.2
Interest on short-term borrowings 14.7 50.8 31.8
Debt discount/cost amortization 9.1 8.3 7.7
Accounts receivable securitization fees 2.6 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)
Other 11.7 15.7 13.1
Total Interest Expense, net $ 370.7 $ 378.9 $ 353.3