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Interest Expense, Net
 12 Months Ended
Dec. 31, 2018
Interest Expense [Abstract]  
Interest Expense, Net
Interest Expense, Net
Year Ended December 31, (in millions)
2018
 
2017
 
2016
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