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Earnings Per Share
 3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
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 March 31,
(In millions, except per share amounts)
2017
 
2016
Numerators
 
 
 
Income from continuing operations attributable to W. R. Grace & Co. shareholders
$
42.9

 
$
10.4

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

 
(9.9
)
Net income (loss) attributable to W. R. Grace & Co. shareholders
$
42.9

 
$
0.5

Denominators
 
 
 
Weighted average common shares—basic calculation
68.3

 
70.6

Dilutive effect of employee stock options
0.2

 
0.5

Weighted average common shares—diluted calculation
68.5


71.1

Basic earnings per share attributable to W. R. Grace & Co. shareholders
 
 
 
Income (loss) from continuing operations
$
0.63

 
$
0.15

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

 
(0.14
)
Net income (loss)
$
0.63

 
$
0.01

Diluted earnings per share attributable to W. R. Grace & Co. shareholders
 
 
 
Income (loss) from continuing operations
$
0.63

 
$
0.15

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

 
(0.14
)
Net income (loss)
$
0.63

 
$
0.01


There were 1.4 million anti-dilutive options outstanding for the three months ended March 31, 2017, compared with 1.1 million for the prior-year quarter.
On February 5, 2015, the Company announced that its Board of Directors had authorized a share repurchase program of up to $500 million. As of March 31, 2017, $23.9 million remained under this authorization. On February 8, 2017, the Company announced that its Board of Directors authorized a new share repurchase program of up to $250 million, expected to be completed over the next 24 to 36 months at the discretion of management. The timing of the repurchases and the actual amount repurchased will depend on a variety of factors, including the market price of the Company's shares, the strategic deployment of capital, and general market and economic conditions. During the three months ended March 31, 2017 and 2016, the Company repurchased 142,371 shares and 210,100 shares of Company common stock for $10.0 million and $15.0 million, respectively, pursuant to the terms of the share repurchase programs.