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Foreign Exchange Gain (Loss)
 12 Months Ended
Dec. 31, 2019
Effect Of Changes In Foreign Exchange Rates [Abstract]  
Foreign Exchange Gain (Loss)
FOREIGN EXCHANGE GAIN (LOSS)
($ millions)
2019

 
2018 (1)
(Revised)

 
Realized gain (loss)
 
 
 
 
CCS - Principal
32.4

 
88.3

 
US dollar long-term debt maturities
(32.4
)
 
(70.3
)
 
Other
(3.7
)
 
4.3

 
Unrealized gain (loss)
 
 
 
 
CCS - Principal and foreign exchange swaps
(141.6
)
 
215.3

 
Translation of US dollar long-term debt
207.7

 
(254.2
)
 
Other
(1.3
)
 
(2.1
)
 
Foreign exchange gain (loss) (1)
61.1

 
(18.7
)
 
(1)
Comparative period revised to reflect current period presentation. Unrealized derivative gain (loss) on CCS and foreign exchange swaps previously included in derivative gains (losses).