Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Schedule of earnings per share
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