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Loss Per Share: Schedule of Earnings per Share, Basic and Diluted (Tables)
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
A reconciliation of net loss and number of shares used in computing basic and diluted loss per share was as follows:
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(Millions, except per share amounts)
 
2020

 
2019

 
2020

 
2019

Basic and diluted loss per share:
 
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
 
Net loss attributable to common shares
 
$
(162.4
)
 
$
(544.1
)
 
$
(264.0
)
 
$
(2,854.4
)
Denominator:
 
 
 
 
 
 
 
 
Basic and diluted shares outstanding
 
 
 
 
 
 
 
 
Weighted average basic and diluted shares outstanding
 
42.7

 
42.6

 
42.7

 
42.6

Basic and diluted loss per share:
 
 
 
 
 
 
 
 
Net loss
 

($3.80
)
 

($12.76
)
 

($6.18
)
 

($66.98
)