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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [abstract]  
Schedule of Goodwill Rollforward
($ millions)
2019

 
2018

 
Goodwill, beginning of year
244.0

 
251.9

 
Southeast Saskatchewan asset dispositions
(13.1
)
 
(6.2
)
 
Other
—

 
(1.7
)
 
Goodwill, end of year
230.9

 
244.0