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Employee Benefit Plans (Details) - Schedule for measurement of benefit plan assets at fair value - USD ($)
$ in Millions
May 31, 2016
May 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets $ 164.2 $ 173.7
Cash and cash equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 4.2 2.4
Equity securities, U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [1] 34.1 34.4
Equity securities, International [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [2] 14.9 16.4
Pooled, Common and Collective Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [3] 93.5 101.8
Equity securities, Fixed Income [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [4] 9.8 10.4
Annuities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 5.5 6.1
Real Estate [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [5] 2.2 2.2
Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 42.5 41.5
Level 1 [Member] | Cash and cash equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 4.2 2.4
Level 1 [Member] | Equity securities, U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [1] 34.1 34.4
Level 1 [Member] | Equity securities, International [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [2] 4.2 4.7
Level 1 [Member] | Pooled, Common and Collective Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [3] 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 [4] 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 [5] 0.0 0.0
Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 116.2 126.1
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] 10.7 11.7
Level 2 [Member] | Pooled, Common and Collective Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [3] 93.5 101.8
Level 2 [Member] | Equity securities, Fixed Income [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [4] 9.8 10.4
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 [5] 2.2 2.2
Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 5.5 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 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 [3] 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 [4] 0.0 0.0
Level 3 [Member] | Annuities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets 5.5 6.1
Level 3 [Member] | Real Estate [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan fair value of plan assets [5] $ 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 bond index funds available to certain qualified retirement plans but not traded openly in any public exchanges.
[4] 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.
[5] 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.