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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Schedule of reconciliation of the numerators and denominators used in calculating basic and diluted earnings per share
The following table shows a reconciliation of the numerators and denominators used in calculating basic and diluted earnings per share.
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(In millions, except per share amounts)
2017
 
2016
 
2017
 
2016
Numerators
 
 
 
 
 
 
 
Income (loss) from continuing operations attributable to W. R. Grace & Co. shareholders
$
47.4

 
$
41.2

 
$
134.2

 
$
89.7

Income (loss) from discontinued operations, net of income taxes
—

 
(1.6
)
 
—

 
(10.9
)
Net income (loss) attributable to W. R. Grace & Co. shareholders
$
47.4

 
$
39.6

 
$
134.2

 
$
78.8

Denominators
 
 
 
 
 
 
 
Weighted average common shares—basic calculation
67.9

 
70.3

 
68.2

 
70.5

Dilutive effect of employee stock options
0.1

 
0.4

 
0.1

 
0.4

Weighted average common shares—diluted calculation
68.0


70.7


68.3


70.9

Basic earnings per share attributable to W. R. Grace & Co. shareholders
 
 
 
 
 
 
 
Income (loss) from continuing operations
$
0.70

 
$
0.59

 
$
1.97

 
$
1.27

Income (loss) from discontinued operations, net of income taxes
—

 
(0.03
)
 
—

 
(0.15
)
Net income (loss)
$
0.70

 
$
0.56

 
$
1.97

 
$
1.12

Diluted earnings per share attributable to W. R. Grace & Co. shareholders
 
 
 
 
 
 
 
Income (loss) from continuing operations
$
0.70

 
$
0.58

 
$
1.96

 
$
1.27

Income (loss) from discontinued operations, net of income taxes
—

 
(0.02
)
 
—

 
(0.16
)
Net income (loss)
$
0.70

 
$
0.56

 
$
1.96

 
$
1.11