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Earnings Per Share
 9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
The following table sets forth a reconciliation of the numerators and denominators used in calculating basic and diluted earnings (loss) per share:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(In millions, except per share amounts)
2019
 
2018
 
2019
 
2018
Numerators
 
 
 
 
 
 
 
Income (loss) from continuing operations attributable to GCP shareholders
$
17.0

 
$
7.2

 
$
34.7

 
$
(35.8
)
(Loss) income from discontinued operations, net of income taxes
(0.4
)
 
18.2

 
5.9

 
26.7

Net income (loss) attributable to GCP shareholders
$
16.6

 
$
25.4

 
$
40.6

 
$
(9.1
)
Denominators
 
 
 
 
 
 
 
Weighted average common shares—basic calculation
72.7

 
72.2

 
72.5

 
72.1

Dilutive effect of employee stock awards(1)
0.1

 
0.5

 
0.4

 
—

Weighted average common shares—diluted calculation
72.8

 
72.7

 
72.9

 
72.1

Basic earnings (loss) per share
 
 
 
 
 
 
 
Income (loss) from continuing operations attributable to GCP shareholders
$
0.23

 
$
0.10

 
$
0.48

 
$
(0.50
)
(Loss) income from discontinued operations, net of income taxes
$
(0.01
)
 
$
0.25

 
$
0.08

 
$
0.37

Net income (loss) attributable to GCP shareholders(2)
$
0.23

 
$
0.35

 
$
0.56

 
$
(0.13
)
Diluted earnings (loss) per share(1)
 
 
 
 
 
 
 
Income (loss) from continuing operations attributable to GCP shareholders
$
0.23

 
$
0.10

 
$
0.48

 
$
(0.50
)
(Loss) income from discontinued operations, net of income taxes
$
(0.01
)
 
$
0.25

 
$
0.08

 
$
0.37

Net income (loss) attributable to GCP shareholders(2)
$
0.23

 
$
0.35

 
$
0.56

 
$
(0.13
)

________________________________
(1) 
Dilutive effect not applicable to periods in which GCP generated a loss from continuing operations.
(2) 
Amounts may not sum due to rounding.
GCP uses the treasury stock method to compute diluted earnings (loss) per share. During the three and nine months ended September 30, 2019, 0.8 million and 0.6 million, respectively, of anti-dilutive stock awards were excluded from the computation of diluted earnings per share during each period based on the treasury stock method as a result of an income from continuing operations generated during the periods then ended. During the three months ended September 30, 2018, 0.4 million of such anti-dilutive stock awards were excluded from the computation of diluted earnings per share.
As of September 30, 2018, total outstanding options of 1.5 million and total outstanding RSUs of 0.4 million were excluded from the computation of diluted loss per share due to a loss from continuing operations incurred during the nine months ended September 30, 2018.
The following table sets forth the weighted average options and RSUs excluded from the computation of dilutive shares and diluted loss per share that would've been reflected in the "Dilutive effect of employee stock awards" line in the table above:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(In millions of shares)
2019
 
2018
 
2019
 
2018
Dilutive effect:(1)
 
 
 
 
 
 
 
Options
N/A
 
N/A
 
N/A
 
0.5

RSUs
N/A
 
N/A
 
N/A
 
0.2

__________________________
(1) 
N/A - Dilutive effect is included in computation of diluted earnings per share under the treasury stock method for periods in which GCP generated income from continuing operations.