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Employee Benefit Plans (Details) - Schedule for measurement of benefit plan assets at fair value - Pension Plans [Member] - USD ($)
$ in Millions
May 31, 2017
May 31, 2016
May 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 161.7 $ 164.2  
Cash and cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 18.9 4.2  
Equity securities, U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 13.7 34.1  
Equity securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 10.3 14.9  
Pooled, Common and Collective Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] 101.4 93.5  
Fixed Income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] 9.6 9.8  
Annuities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5.8 5.5  
Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5] 2.0 2.2  
U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 132.5 135.1 $ 143.2
U.S. [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 31.1 41.6  
U.S. [Member] | Level 1 [Member] | Cash and cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 18.4 3.3  
U.S. [Member] | Level 1 [Member] | Equity securities, U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 12.7 34.1  
U.S. [Member] | Level 1 [Member] | Equity securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 0.0 4.2  
U.S. [Member] | Level 1 [Member] | Pooled, Common and Collective Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] 0.0 0.0  
U.S. [Member] | Level 1 [Member] | Fixed Income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] 0.0 0.0  
U.S. [Member] | Level 1 [Member] | Annuities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. [Member] | Level 1 [Member] | Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5] 0.0 0.0  
U.S. [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 101.4 93.5  
U.S. [Member] | Level 2 [Member] | Cash and cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
U.S. [Member] | Level 2 [Member] | Equity securities, U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 0.0 0.0  
U.S. [Member] | Level 2 [Member] | Equity securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 0.0 0.0  
U.S. [Member] | Level 2 [Member] | Pooled, Common and Collective Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] 101.4 93.5  
U.S. [Member] | Level 2 [Member] | Fixed Income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] 0.0 0.0  
U.S. [Member] | Level 2 [Member] | Annuities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. [Member] | Level 2 [Member] | Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5] 0.0 0.0  
U.S. [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. [Member] | Level 3 [Member] | Cash and cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
U.S. [Member] | Level 3 [Member] | Equity securities, U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 0.0 0.0  
U.S. [Member] | Level 3 [Member] | Equity securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 0.0 0.0  
U.S. [Member] | Level 3 [Member] | Pooled, Common and Collective Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] 0.0 0.0  
U.S. [Member] | Level 3 [Member] | Fixed Income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] 0.0 0.0  
U.S. [Member] | Level 3 [Member] | Annuities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. [Member] | Level 3 [Member] | Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5] 0.0 0.0  
U.K. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 29.2 29.1 $ 30.5
U.K. [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.5 0.9  
U.K. [Member] | Level 1 [Member] | Cash and cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.5 0.9  
U.K. [Member] | Level 1 [Member] | Equity securities, U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 1.0 0.0  
U.K. [Member] | Level 1 [Member] | Equity securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 0.0 0.0  
U.K. [Member] | Level 1 [Member] | Pooled, Common and Collective Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] 0.0 0.0  
U.K. [Member] | Level 1 [Member] | Fixed Income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] 0.0 0.0  
U.K. [Member] | Level 1 [Member] | Annuities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.K. [Member] | Level 1 [Member] | Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5] 0.0 0.0  
U.K. [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 21.9 22.7  
U.K. [Member] | Level 2 [Member] | Cash and cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.K. [Member] | Level 2 [Member] | Equity securities, U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 0.0 0.0  
U.K. [Member] | Level 2 [Member] | Equity securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 10.3 10.7  
U.K. [Member] | Level 2 [Member] | Pooled, Common and Collective Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] 0.0 0.0  
U.K. [Member] | Level 2 [Member] | Fixed Income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] 9.6 9.8  
U.K. [Member] | Level 2 [Member] | Annuities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.K. [Member] | Level 2 [Member] | Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5] 2.0 2.2  
U.K. [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5.8 5.5  
U.K. [Member] | Level 3 [Member] | Cash and cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.K. [Member] | Level 3 [Member] | Equity securities, U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 0.0 0.0  
U.K. [Member] | Level 3 [Member] | Equity securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 0.0 0.0  
U.K. [Member] | Level 3 [Member] | Pooled, Common and Collective Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] 0.0 0.0  
U.K. [Member] | Level 3 [Member] | Fixed Income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] 0.0 0.0  
U.K. [Member] | Level 3 [Member] | Annuities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5.8 5.5  
U.K. [Member] | Level 3 [Member] | Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
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.