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Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2020
Earnings Per Common Share  
Schedule of components of basic and diluted earnings (loss) per common share
The components of basic and diluted earnings (loss) per common share comprised the following (in millions, except per share amounts):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2020
 
2019
 
2020
 
2019
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
107.1

 
$
205.1

 
$
244.8

 
$
(289.5
)
Denominator:
 

 
 

 
 
 
 
Weighted average outstanding shares — basic
44.1

 
43.8

 
44.0

 
43.8

Effect of dilutive securities(1):
 

 
 

 
 
 
 
Stock options, restricted stock units, and employee stock purchase plan
0.3

 
0.2

 
0.3

 
—

Weighted average shares — diluted(2)
44.4

 
44.0

 
44.3

 
43.8

Net income (loss) per common share:
 

 
 

 
 
 
 
Basic
$
2.43

 
$
4.68

 
$
5.56

 
$
(6.61
)
Diluted
$
2.41

 
$
4.66

 
$
5.53

 
$
(6.61
)
 
 
 
 
 
 
 
 
Stock options and restricted stock units excluded from calculation(2)
7.2

 
7.9

 
7.4

 
6.6

 __________________________
(1)
Calculated using the treasury stock method.
(2)
The common shares underlying certain stock options and restricted stock units have been excluded from the computation of diluted earnings per share because their impact would be anti-dilutive for the three- and six-month periods ended June 30, 2020 and the three-month period ended June 30, 2019. For the six-month period ended June 30, 2019, we had a net loss, and as such, all outstanding stock options, restricted stock units, and shares issuable under the ESPP were excluded from our calculation of diluted earnings per share.