Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Short-term Return on Assets

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Defined Benefit Plan, Average Remaining Life Expectancy

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Defined Benefit Plan, Benefit Obligation, Benefits Paid, Vested Participants

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Other Comprehensive Income Defined Benefit Plans Tax Expense Benefit

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Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax

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Percentage of federal subsidy to sponsors of retiree health care benefit plans.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

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Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year.

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Amount of decrease in accumulated postretirement benefit obligation for government subsidy related to prescription drug benefits attributed to past service.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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Amount, after tax, before reclassification adjustment, of (increase) decrease in accumulated other comprehensive income of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Employee Benefit Plans (Details) - USD ($) $ in Millions			3 Months Ended	12 Months Ended
Employee Benefit Plans (Details) - USD ($) $ in Millions	Nov. 30, 2018	Feb. 14, 2018	Nov. 30, 2018	May 31, 2019	May 31, 2018	May 31, 2017
Employee Benefit Plans (Details) [Line Items]
Percentage of federal subsidy to sponsors of retiree health care benefit plans				28.00%
Cumulative reduction of its accumulated post-retirement benefit obligation	$ 2.7			$ 1.5	$ 2.3	$ 2.5
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax			$ 2.7
Defined benefit plans tax expense recognized in AOCI				0.5	(20.9)	(0.4)
Estimated employer contributions in 2015				1.1
Contribution to retirement plan				$ 7.6	7.2	7.1
Defined Benefit Plan, Prescription Drug Benefit, Net Periodic Postretirement Benefit Cost, Remaining Life				13 years
Annuities [Member] \| Level 3 [Member]
Employee Benefit Plans (Details) [Line Items]
Fair value of annuities				$ 5.5	5.7
Pension Plans [Member]
Employee Benefit Plans (Details) [Line Items]
Cost of contracts				0.0	0.0
Estimated net loss to be recognized over next twelve months				1.0
Other Postretirement Benefits [Member]
Employee Benefit Plans (Details) [Line Items]
Cost of contracts				0.0	0.0
Settlement charge				$ 0.0	$ 0.0	$ 0.0
Expected long-term return on plan assets				0.00%	0.00%	0.00%
Expected short-term return on plan assets				0.00%	0.00%	0.00%
Estimated net loss to be recognized over next twelve months				$ 0.2
U.S. [Member] \| Pension Plans [Member]
Employee Benefit Plans (Details) [Line Items]
Lump sum benefit payments					$ 0.0
Cost of contracts		$ 86.3			125.2
Settlement charge					$ (57.3)	$ 0.0
Expected long-term return on plan assets					0.00%	0.00%
Expected short-term return on plan assets				4.80%	4.80%	4.80%
U.K. [Member] \| Pension Plans [Member]
Employee Benefit Plans (Details) [Line Items]
Settlement charge				$ 0.0	$ 0.0	$ 0.0
Expected long-term return on plan assets				3.40%	3.40%	3.90%
Expected short-term return on plan assets				0.00%	0.00%	0.00%
Amount reclassified from Accumulated other comprehensive income (loss) [Member] \| Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Employee Benefit Plans (Details) [Line Items]
Accumulated other comprehensive loss reversed					$ (55.0)
Current Assets [Member] \| Other Postretirement Benefits [Member]
Employee Benefit Plans (Details) [Line Items]
Plan assets				$ 0.0	0.0
Current Assets [Member] \| U.S. [Member] \| Pension Plans [Member]
Employee Benefit Plans (Details) [Line Items]
Plan assets					1.6
Current Assets [Member] \| U.K. [Member] \| Pension Plans [Member]
Employee Benefit Plans (Details) [Line Items]
Plan assets				$ 0.0	$ 0.0