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Earnings Per Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Nov. 30, 2011
Nov. 30, 2010
Nov. 30, 2011
Nov. 30, 2010
Earnings Per Share Reconciliation [Abstract]        
Net earnings attributable to Mosaic $ 623.6 $ 1,025.6 $ 1,149.6 $ 1,323.3
Basic weighted average common shares outstanding 443.4 445.8 445.0 445.6
Common stock issuable upon vesting of restricted stock awards 0.4 0.3 0.4 0.3
Common stock equivalents 0.8 1.2 0.8 1.2
Common stock issuable upon vesting of market stock units 0.1 0 0.1 0
Diluted weighted average common shares outstanding 444.7 447.3 446.3 447.1
Net Earnings per share attributable to Mosaic- basic $ 1.41 $ 2.30 $ 2.58 $ 2.97
Net Earnings per share attributable to Mosaic- diluted $ 1.40 $ 2.29 $ 2.58 $ 2.96
Earnings Per Share Additional Disclosure [Abstract]        
Shares subject to issuance upon exercise of stock options and restricted stock awards 0.8 0.5 0.7 0.5