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Interest Expense
 12 Months Ended
Dec. 31, 2019
Analysis of income and expense [abstract]  
Interest Expense
INTEREST EXPENSE
($ millions)
2019

 
2018 (1)
(Revised)

 
Realized
 
 
 
 
Interest expense on long-term debt
146.8

 
184.4

 
Unrealized (gain) loss
 
 
 
 
CCS - Interest
23.6

 
(20.7
)
 
Interest expense
170.4

 
163.7

 
(1)
Comparative period revised to reflect current period presentation. Unrealized derivative gain (loss) on interest rate contracts previously included in derivative gains (losses).