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Interest Expense, Net (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Interest Expense [Abstract]      
Interest on long-term debt $ 336.4 $ 354.2 $ 327.7
Interest on short-term borrowings 0.6 14.7 50.8
Debt discount/cost amortization 11.0 9.1 8.3
Accounts receivable securitization fees 1.4 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)
Other 11.0 11.7 15.7
Total Interest Expense, net $ 341.1 $ 370.7 $ 378.9