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Income Taxes (Details 3) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Reconciliation of gross unrecognized tax benefits      
Balance as of beginning of fiscal year $ 26.7 $ 41.7 $ 41.2
Additions for tax positions of the current year 11.2 28.5 0.4
Additions for tax positions of prior years 4.2 12.2 1.3
Reductions for tax positions of prior years (1.8) (0.5) (0.1)
Settlements with tax authorities 0 (55.0) (0.7)
Expiration of the statute of limitations (0.3) (0.2) (0.4)
Balance as of end of fiscal year $ 40.0 $ 26.7 $ 41.7