Employee Benefit Plans (Details) - Schedule for measurement of benefit plan assets at fair value - USD ($) $ in Millions		May 31, 2018		May 31, 2017		May 31, 2016
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		$ 32.4		161.7
Pension Plans [Member] | Cash and cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		2.4		18.9
Pension Plans [Member] | Equity securities, U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	1.5		13.7
Pension Plans [Member] | Equity securities, International [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[2]	10.4		10.3
Pension Plans [Member] | Pooled, Common and Collective Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[3]	10.1		101.4	[4]
Pension Plans [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[5]			9.6
Pension Plans [Member] | Annuities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		5.7		5.8
Pension Plans [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		2.3	[5]	2.0	[6]
Pension Plans [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		1.6		132.5		$ 135.1
Pension Plans [Member] | U.S. [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		1.6		31.1
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		18.4
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		12.7
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		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]	0.0		0.0	[4]
Pension Plans [Member] | U.S. [Member] | Level 1 [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[5]			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		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		0.0	[5]	0.0	[6]
Pension Plans [Member] | U.S. [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0.0		101.4
Pension Plans [Member] | U.S. [Member] | Level 2 [Member] | Cash and cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		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		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		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]	0.0		101.4	[4]
Pension Plans [Member] | U.S. [Member] | Level 2 [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[5]			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		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		0.0	[5]	0.0	[6]
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] | Cash and cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		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		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		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]	0.0		0.0	[4]
Pension Plans [Member] | U.S. [Member] | Level 3 [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[5]			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		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		0.0	[5]	0.0	[6]
Pension Plans [Member] | U.K. [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		30.8		29.2		$ 29.1
Pension Plans [Member] | U.K. [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		12.7		11.8
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		0.8		0.5
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]	1.5		1.0
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]	10.4		10.3
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] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[5]			0.0
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		0.0	[5]	0.0	[6]
Pension Plans [Member] | U.K. [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		12.4		11.6
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]	10.1		0.0	[4]
Pension Plans [Member] | U.K. [Member] | Level 2 [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[5]			9.6
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		2.3	[5]	2.0	[6]
Pension Plans [Member] | U.K. [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		5.7		5.8
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] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[5]			0.0
Pension Plans [Member] | U.K. [Member] | Level 3 [Member] | Annuities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		5.7		5.8
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 any public exchanges. There are no restrictions on these investments.

[5] 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.

[6] 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.