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Earnings (Loss) per Share
6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Earnings (loss) per share Earnings (Loss) per Share
Basic earnings (loss) per share is computed by dividing net income (loss) for the period by the weighted average number of common shares outstanding during the period. Diluted earnings (loss) per share is computed by dividing net income (loss) for the period by the weighted average number of common shares and potentially dilutive common shares outstanding for the period. The calculation of diluted net income per share excludes all antidilutive common shares.
Three Months Ended June 30,Six Months Ended June 30,
In millions, except share and per share data2020201920202019
Net income (loss) $20.2  $56.8  $65.5  $79.5  
Basic and Diluted earnings (loss) per share
Basic earnings (loss) per share $0.49  $1.36  $1.58  $1.90  
Diluted earnings (loss) per share 0.49  1.34  1.57  1.88  
Shares (in thousands)
Weighted average number of common shares outstanding - Basic41,233  41,844  41,463  41,770  
Weighted average additional shares assuming conversion of potential common shares137  358  199  440  
Shares - diluted basis41,370  42,202  41,662  42,210  

The following average number of potential common shares were antidilutive, and therefore, were not included in the diluted earnings per share calculation:
Three Months Ended June 30,Six Months Ended June 30,
In thousands2020201920202019
Average number of potential common shares - antidilutive288  135  286  91