Annual report pursuant to Section 13 and 15(d)

Investment Income, Net (Details)

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Investment Income, Net (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
May 31, 2014
Feb. 28, 2014
Nov. 30, 2013
Aug. 31, 2013
May 31, 2013
Feb. 28, 2013
Nov. 30, 2012
Aug. 31, 2012
May 31, 2014
May 31, 2013
May 31, 2012
Investment Income, Net [Abstract]                      
Interest income on corporate funds                 $ 6.9 $ 6.7 $ 6.5
Interest expense                 (1.1) (0.1) (0.1)
Net loss from equity-method Investments                 (0.4) 0 0
Investment income, net $ 1.4 $ 1.5 $ 1.3 $ 1.2 $ 1.4 $ 1.4 $ 1.9 $ 1.9 $ 5.4 $ 6.6 $ 6.4