Other Non-current Assets - Investments in Joint Ventures (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Nov. 30, 2023	Nov. 30, 2022	Nov. 30, 2023	Nov. 30, 2022	Nov. 30, 2021
Investments in Joint Ventures
Income (losses) from joint ventures	$ 0.6	$ (0.7)	$ (0.3)	$ (1.3)
Owned Through Joint Ventures \| Joint venture in India
Investments in Joint Ventures
Investments in joint ventures	$ 6.5		$ 6.5		$ 10.0
Ownership interest in joint ventures (as a percent)					40.00%
Percentage on outstanding debt	40.00%		40.00%
Amount of guarantee liability recognized	$ 9.5		$ 9.5
Loan to joint venture	3.5		3.5
Income (losses) from joint ventures	$ 0.7	$ (0.6)	$ 0.1	$ (0.8)

Fair value of guarantee obligation recorded as current liability.

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Percentage of guarantee on outstanding debt.

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The amount of loan outstanding to the joint venture.

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No definition available.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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