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Employee Benefit Plans (Details) - Schedule for measurement of benefit plan assets at fair value - USD ($)
$ in Millions
May. 31, 2015
May. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets $ 173.7 $ 188.6
Cash and cash equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 2.4 7.1
Equity securities, U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [1] 34.4 39.8
Equity securities, International [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [2] 16.4 22.4
Pooled, Common and Collective Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [2] 101.8 101.3
Equity securities, Fixed Income [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [3] 10.4 9.7
Annuities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 6.1 6.2
Real Estate [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [4] 2.2 2.1
Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 41.5 57.2
Level 1 [Member] | Cash and cash equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 2.4 7.1
Level 1 [Member] | Equity securities, U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [1] 34.4 39.8
Level 1 [Member] | Equity securities, International [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [2] 4.7 10.3
Level 1 [Member] | Pooled, Common and Collective Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [2] 0.0 0.0
Level 1 [Member] | Equity securities, Fixed Income [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [3] 0.0 0.0
Level 1 [Member] | Annuities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 0.0 0.0
Level 1 [Member] | Real Estate [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [4] 0.0 0.0
Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 126.1 125.2
Level 2 [Member] | Cash and cash equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 0.0 0.0
Level 2 [Member] | Equity securities, U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [1] 0.0 0.0
Level 2 [Member] | Equity securities, International [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [2] 11.7 12.1
Level 2 [Member] | Pooled, Common and Collective Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [2] 101.8 101.3
Level 2 [Member] | Equity securities, Fixed Income [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [3] 10.4 9.7
Level 2 [Member] | Annuities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 0.0 0.0
Level 2 [Member] | Real Estate [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [4] 2.2 2.1
Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 6.1 6.2
Level 3 [Member] | Cash and cash equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 0.0 0.0
Level 3 [Member] | Equity securities, U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [1] 0.0 0.0
Level 3 [Member] | Equity securities, International [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [2] 0.0 0.0
Level 3 [Member] | Pooled, Common and Collective Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [2] 0.0 0.0
Level 3 [Member] | Equity securities, Fixed Income [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [3] 0.0 0.0
Level 3 [Member] | Annuities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 6.1 6.2
Level 3 [Member] | Real Estate [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [4] $ 0.0 $ 0.0
[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.