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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2016
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)
2016
 
2015
 
2016
 
2015
Numerators
 
 
 
 
 
 
 
Income from continuing operations attributable to W. R. Grace & Co. shareholders
$
41.2

 
$
33.7

 
$
89.7

 
$
96.5

(Loss) income from discontinued operations, net of income taxes
(1.6
)
 
(19.9
)
 
(10.9
)
 
27.4

Net income attributable to W. R. Grace & Co. shareholders
$
39.6

 
$
13.8

 
$
78.8

 
$
123.9

Denominators
 
 
 
 
 
 
 
Weighted average common shares—basic calculation
70.3

 
72.1

 
70.5

 
72.5

Dilutive effect of employee stock options
0.4

 
0.6

 
0.4

 
0.6

Weighted average common shares—diluted calculation
70.7

 
72.7

 
70.9

 
73.1

Basic earnings per share attributable to W. R. Grace & Co. shareholders
 
 
 
 
 
 
 
Income from continuing operations
$
0.59

 
$
0.47

 
$
1.27

 
$
1.33

(Loss) income from discontinued operations, net of income taxes
(0.03
)
 
(0.28
)
 
(0.15
)
 
0.38

Net income
$
0.56

 
$
0.19

 
$
1.12

 
$
1.71

Diluted earnings per share attributable to W. R. Grace & Co. shareholders
 
 
 
 
 
 
 
Income from continuing operations
$
0.58

 
$
0.46

 
$
1.27

 
$
1.32

(Loss) income from discontinued operations, net of income taxes
(0.02
)
 
(0.27
)
 
(0.16
)
 
0.37

Net income
$
0.56

 
$
0.19

 
$
1.11

 
$
1.69