Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details 3)

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Income Taxes (Details 3) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2012
May 31, 2011
May 31, 2010
Reconciliation of gross unrecognized tax benefits, not including interest or potential offsetting effects      
Balance as of beginning of fiscal year $ 41.2 $ 35.8 $ 35.8
Additions for tax positions of the current year 0.4 6.0 0.5
Additions for tax positions of prior years 1.3 0.1  
Reductions for tax positions of prior years (0.1) (0.1)  
Settlements with tax authorities (0.7)    
Expiration of the statute of limitations (0.4) (0.6) (0.5)
Balance as of end of fiscal year $ 41.7 $ 41.2 $ 35.8