Earnings Per Share
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share
For the three months ended March 31, 2015, the numerator for basic and diluted earnings per share ("EPS") is net earnings attributable to Mosaic. The denominator for basic EPS is the weighted average number of shares outstanding during the period. The denominator for diluted EPS also includes the weighted average number of additional common shares that would have been outstanding if the dilutive potential common shares had been issued, unless the shares are anti-dilutive.
For the three months ended March 31, 2014, we used the two-class method to compute basic and diluted EPS. Earnings for the period were allocated pro-rata between the common stockholders and the participating securities. During the period, our only participating securities related to the Share Repurchase Agreements. Share repurchases under these agreements were completed during the third quarter of 2014. The numerator for basic and diluted EPS is net earnings for common stockholders. The denominator for basic EPS is the weighted-average number of shares outstanding during the period, excluding the effects of shares subject to forward contracts. The denominator for diluted EPS also includes the weighted average number of additional shares of common stock that would have been outstanding if the dilutive potential shares of common stock had been issued, unless the shares are anti-dilutive, and excludes the effects of shares subject to forward contracts.
The following is a reconciliation of the numerator and denominator for the basic and diluted EPS computations:
 
Three months ended
March 31,
2015
 
2014
Net earnings attributed to Mosaic
$
294.8

 
$
217.5

Undistributed earnings attributable to participating securities
—

 
(12.4
)
Numerator for basic and diluted earnings available to common stockholders
$
294.8

 
$
205.1

Basic weighted average number of shares outstanding
366.0

 
401.1

Shares subject to forward contract
—

 
(22.9
)
Basic weighted average number of shares outstanding attributable to common stockholders
366.0

 
378.2

Dilutive impact of share-based awards
1.9

 
1.4

Diluted weighted average number of shares outstanding
367.9

 
379.6

Basic net earnings per share
$
0.81

 
$
0.54

Diluted net earnings per share
$
0.80

 
$
0.54


A total of 1.3 million shares of Common Stock subject to issuance upon exercise of stock options for the three months ended March 31, 2015 and 2014 have been excluded from the calculation of diluted EPS as the effect would have been anti-dilutive.