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Loss per share (Tables)
12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Schedule of securities excluded from calculations of diluted loss per share
As a result, the following potentially dilutive instruments were excluded from those calculations:
(in millions)
Year ended December 31,
2019
 
2018
 
2017
MCPS
62.9

 

 

Stock-based awards
27.2

 
21.1

 
19.6

Total
90.1

 
21.1

 
19.6