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Interest Expense, Net (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Interest Expense [Abstract]      
Interest on long-term debt $ 342.2 $ 354.8 $ 352.3
Interest on short-term borrowings 31.8 14.9 9.2
Debt discount/cost amortization 7.7 7.2 7.6
Accounts receivable securitization fees 2.6 2.5 2.3
Allowance for borrowed funds used and interest capitalized during construction (9.1) (6.2) (5.6)
Debt-based post-in-service carrying charges (35.0) (36.4) (35.1)
Other 13.1 16.4 18.8
Total Interest Expense, net $ 353.3 $ 353.2 $ 349.5