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Employee Benefit Plans (Details) - Schedule for measurement of benefit plan assets at fair value - USD ($)
$ in Millions
May 31, 2019
May 31, 2018
May 31, 2017
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 3 [Member] | Cash and cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 31.8 32.4  
Pension Plans [Member] | Cash and cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.9 2.4  
Pension Plans [Member] | Equity securities, U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 1.1 1.5  
Pension Plans [Member] | Equity securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 10.0 10.4  
Pension Plans [Member] | Pooled, Common and Collective Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] 12.0 10.1 [4]  
Pension Plans [Member] | Annuities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5.5 5.7  
Pension Plans [Member] | Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2.3 [5] 2.3 [6]  
Pension Plans [Member] | U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 1.6 $ 132.5
Pension Plans [Member] | U.S. [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 1.6  
Pension Plans [Member] | U.S. [Member] | Level 1 [Member] | Cash and cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   1.6  
Pension Plans [Member] | U.S. [Member] | Level 1 [Member] | Equity securities, U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1]   0.0  
Pension Plans [Member] | U.S. [Member] | Level 1 [Member] | Equity securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2]   0.0  
Pension Plans [Member] | U.S. [Member] | Level 1 [Member] | Pooled, Common and Collective Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3],[4]   0.0  
Pension Plans [Member] | U.S. [Member] | Level 1 [Member] | Annuities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Pension Plans [Member] | U.S. [Member] | Level 1 [Member] | Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [6]   0.0  
Pension Plans [Member] | U.S. [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Pension Plans [Member] | 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  
Pension Plans [Member] | U.S. [Member] | Level 2 [Member] | Equity securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2]   0.0  
Pension Plans [Member] | U.S. [Member] | Level 2 [Member] | Pooled, Common and Collective Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3],[4]   0.0  
Pension Plans [Member] | U.S. [Member] | Level 2 [Member] | Annuities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Pension Plans [Member] | U.S. [Member] | Level 2 [Member] | Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [6]   0.0  
Pension Plans [Member] | U.S. [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Pension Plans [Member] | 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  
Pension Plans [Member] | U.S. [Member] | Level 3 [Member] | Equity securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2]   0.0  
Pension Plans [Member] | U.S. [Member] | Level 3 [Member] | Pooled, Common and Collective Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3],[4]   0.0  
Pension Plans [Member] | U.S. [Member] | Level 3 [Member] | Annuities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Pension Plans [Member] | U.S. [Member] | Level 3 [Member] | Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [6]   0.0  
Pension Plans [Member] | U.K. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 31.8 30.8 $ 29.2
Pension Plans [Member] | U.K. [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 14.3 15.0  
Pension Plans [Member] | U.K. [Member] | Level 1 [Member] | Cash and cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.9 0.8  
Pension Plans [Member] | U.K. [Member] | Level 1 [Member] | Equity securities, U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 1.1 1.5  
Pension Plans [Member] | U.K. [Member] | Level 1 [Member] | Equity securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 10.0 10.4  
Pension Plans [Member] | 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 [4]  
Pension Plans [Member] | U.K. [Member] | Level 1 [Member] | Annuities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Pension Plans [Member] | U.K. [Member] | Level 1 [Member] | Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2.3 [5] 2.3 [6]  
Pension Plans [Member] | U.K. [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 12.0 10.1  
Pension Plans [Member] | 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  
Pension Plans [Member] | 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  
Pension Plans [Member] | U.K. [Member] | Level 2 [Member] | Equity securities, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 0.0 0.0  
Pension Plans [Member] | U.K. [Member] | Level 2 [Member] | Pooled, Common and Collective Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] 12.0 10.1 [4]  
Pension Plans [Member] | U.K. [Member] | Level 2 [Member] | Annuities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Pension Plans [Member] | U.K. [Member] | Level 2 [Member] | Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 [5] 0.0 [6]  
Pension Plans [Member] | U.K. [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5.5 5.7  
Pension Plans [Member] | 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  
Pension Plans [Member] | 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  
Pension Plans [Member] | 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  
Pension Plans [Member] | 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 [4]  
Pension Plans [Member] | U.K. [Member] | Level 3 [Member] | Annuities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5.5 5.7  
Pension Plans [Member] | U.K. [Member] | Level 3 [Member] | Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0.0 [5] $ 0.0 [6]  
[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 stocks of non-U.S. companies, primarily in Europe and Asia. There are no restrictions on these investments.
[3] Funds which invest in UK government bonds and bond index-linked investments and interest rate and inflation swaps. There are no restrictions on these investments.
[4] Funds which invest in bond index funds available to certain qualified retirement plans but not traded openly in anypublic exchanges. There are no restrictions on these investments.
[5] .
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