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Employee Benefit Plans (Details) - Schedule for measurement of benefit plan assets at fair value (USD $)
In Millions, unless otherwise specified
May 31, 2014
May 31, 2013
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets $ 188.6 $ 173.8
Cash and cash equivalents [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 7.1 3.5
Equity securities, U.S. [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 141.1 [1] 94.0 [1]
Equity securities, International [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 22.4 [2] 26.7 [2]
Equity securities, Fixed Income [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 9.7 [3] 41.8 [3]
Annuities [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 6.2 6.1
Real Estate [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 2.1 [4] 1.7 [4]
Level 1 [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 57.2 148.2
Level 1 [Member] | Cash and cash equivalents [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 7.1 3.5
Level 1 [Member] | Equity securities, U.S. [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 39.8 [1] 94.0 [1]
Level 1 [Member] | Equity securities, International [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 10.3 [2] 16.3 [2]
Level 1 [Member] | Equity securities, Fixed Income [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 0 [3] 34.4 [3]
Level 1 [Member] | Annuities [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 0 0
Level 1 [Member] | Real Estate [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 0 [4] 0 [4]
Level 2 [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 125.2 19.5
Level 2 [Member] | Cash and cash equivalents [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 0 0
Level 2 [Member] | Equity securities, U.S. [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 101.3 [1] 0 [1]
Level 2 [Member] | Equity securities, International [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 12.1 [2] 10.4 [2]
Level 2 [Member] | Equity securities, Fixed Income [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 9.7 [3] 7.4 [3]
Level 2 [Member] | Annuities [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 0 0
Level 2 [Member] | Real Estate [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 2.1 [4] 1.7 [4]
Level 3 [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 6.2 6.1
Level 3 [Member] | Cash and cash equivalents [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 0 0
Level 3 [Member] | Equity securities, U.S. [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 0 [1] 0 [1]
Level 3 [Member] | Equity securities, International [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 0 [2] 0 [2]
Level 3 [Member] | Equity securities, Fixed Income [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 0 [3] 0 [3]
Level 3 [Member] | Annuities [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 6.2 6.1
Level 3 [Member] | Real Estate [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets $ 0 [4] $ 0 [4]
[1] Funds which invest in a diversified portfolio of publicly traded U.S. common stocks of large-cap, medium-cap and small-cap companies. There are no restrictions on these investments.
[2] Funds which invest in a diversified portfolio of publicly traded common stock of non-U.S. companies, primarily in Europe and Asia. There are no restrictions on these investments.
[3] Funds which invest in a diversified portfolio of publicly traded government bonds, corporate bonds and mortgage-backed securities. There are no restrictions on these investments.
[4] Represents assets of a non-U.S. entity plan invested in a fund whose underlying investments are comprised of properties. The fund has publicly available quoted market prices and there are no restrictions on these investments.