Changes in Equity - Summary of Changes in Equity by Component and in Total (Detail) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Feb. 29, 2024	Nov. 30, 2023	Aug. 31, 2023	Feb. 28, 2023	Nov. 30, 2022	Aug. 31, 2022	Feb. 29, 2024	Feb. 28, 2023
Balance	$ 1,171.5	$ 1,247.4	$ 1,154.6	$ 1,223.2	$ 1,323.2	$ 1,266.3	$ 1,154.6	$ 1,266.3
Net earnings (loss)	52.4	(2.1)	62.1	9.3	(12.5)	31.3	112.4	28.1
Other comprehensive (loss) income	(7.1)	11.1	(8.2)	24.7	(3.5)	(13.3)	(4.2)	7.9
Transfers to the Former Parent, net		(84.9)		(96.3)	(72.2)
Distribution to the Former Parent in connection with the Separation	(150.0)
Transfers from the Former Parent, net	11.4		40.8			38.9
Transfer of Net Investment by Former Parent to Additional Paid-in Capital	0.0
Common shares issued, net of withholding tax	(0.1)
Stock-based compensation	2.2
Cash dividends declared	(8.1)
Dividends to noncontrolling interests	(1.9)	0.0	(1.9)	0.0	(11.8)	0.0
Balance	1,070.3	1,171.5	1,247.4	1,160.9	1,223.2	1,323.2	1,070.3	1,160.9
Common Shares
Balance	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Net earnings (loss)	0.0	0.0	0.0	0.0	0.0	0.0
Other comprehensive (loss) income	0.0	0.0	0.0	0.0	0.0	0.0
Transfers to the Former Parent, net		0.0		0.0	0.0
Distribution to the Former Parent in connection with the Separation	0.0
Transfers from the Former Parent, net	0.0		0.0			0.0
Transfer of Net Investment by Former Parent to Additional Paid-in Capital	0.0
Common shares issued, net of withholding tax	0.0
Stock-based compensation	0.0
Cash dividends declared	0.0
Dividends to noncontrolling interests	0.0	0.0	0.0	0.0	0.0	0.0
Balance	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Additional Paid-in Capital
Balance	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Net earnings (loss)	0.0	0.0	0.0	0.0	0.0	0.0
Other comprehensive (loss) income	0.0	0.0	0.0	0.0	0.0	0.0
Transfers to the Former Parent, net		0.0		0.0	0.0
Distribution to the Former Parent in connection with the Separation	(150.0)
Transfers from the Former Parent, net	11.4		0.0			0.0
Transfer of Net Investment by Former Parent to Additional Paid-in Capital	1,039.5
Common shares issued, net of withholding tax	(0.1)
Stock-based compensation	2.2
Cash dividends declared	0.0
Dividends to noncontrolling interests	0.0	0.0	0.0	0.0	0.0	0.0
Balance	903.0	0.0	0.0	0.0	0.0	0.0	903.0	0.0
Retained Earnings
Balance	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Net earnings (loss)	49.0	0.0	0.0	0.0	0.0	0.0
Other comprehensive (loss) income	0.0	0.0	0.0	0.0	0.0	0.0
Transfers to the Former Parent, net		0.0		0.0	0.0
Distribution to the Former Parent in connection with the Separation	0.0
Transfers from the Former Parent, net	0.0		0.0			0.0
Transfer of Net Investment by Former Parent to Additional Paid-in Capital	0.0
Common shares issued, net of withholding tax	0.0
Stock-based compensation	0.0
Cash dividends declared	(8.1)
Dividends to noncontrolling interests	0.0	0.0	0.0	0.0	0.0	0.0
Balance	40.9	0.0	0.0	0.0	0.0	0.0	40.9	0.0
Net Investment by the Former Parent
Balance	1,039.5	1,130.4	1,031.1	1,112.3	1,200.3	1,131.3	1,031.1	1,131.3
Net earnings (loss)	0.0	(6.0)	58.5	5.4	(15.8)	30.1
Other comprehensive (loss) income	0.0	0.0	0.0	0.0	0.0	0.0
Transfers to the Former Parent, net		(84.9)		(96.3)	(72.2)
Distribution to the Former Parent in connection with the Separation	0.0
Transfers from the Former Parent, net	0.0		40.8			38.9
Transfer of Net Investment by Former Parent to Additional Paid-in Capital	(1,039.5)
Common shares issued, net of withholding tax	0.0
Stock-based compensation	0.0
Cash dividends declared	0.0
Dividends to noncontrolling interests	0.0	0.0	0.0	0.0	0.0	0.0
Balance	0.0	1,039.5	1,130.4	1,021.4	1,112.3	1,200.3	0.0	1,021.4
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance	0.8	(10.3)	(2.1)	(15.0)	(11.5)	1.8	(2.1)	1.8
Net earnings (loss)	0.0	0.0	0.0	0.0	0.0	0.0
Other comprehensive (loss) income	(7.1)	11.1	(8.2)	24.7	(3.5)	(13.3)
Transfers to the Former Parent, net		0.0		0.0	0.0
Distribution to the Former Parent in connection with the Separation	0.0
Transfers from the Former Parent, net	0.0		0.0			0.0
Transfer of Net Investment by Former Parent to Additional Paid-in Capital	0.0
Common shares issued, net of withholding tax	0.0
Stock-based compensation	0.0
Cash dividends declared	0.0
Dividends to noncontrolling interests	0.0	0.0	0.0	0.0	0.0	0.0
Balance	(6.3)	0.8	(10.3)	9.7	(15.0)	(11.5)	(6.3)	9.7
Parent
Balance	1,040.3	1,120.1	1,029.0	1,097.3	1,188.8	1,133.1	1,029.0	1,133.1
Net earnings (loss)	49.0	(6.0)	58.5	5.4	(15.8)	30.1
Other comprehensive (loss) income	(7.1)	11.1	(8.2)	24.7	(3.5)	(13.3)
Transfers to the Former Parent, net		(84.9)		(96.3)	(72.2)
Distribution to the Former Parent in connection with the Separation	(150.0)
Transfers from the Former Parent, net	11.4		40.8			38.9
Transfer of Net Investment by Former Parent to Additional Paid-in Capital	0.0
Common shares issued, net of withholding tax	(0.1)
Stock-based compensation	2.2
Cash dividends declared	(8.1)
Dividends to noncontrolling interests	0.0	0.0	0.0	0.0	0.0	0.0
Balance	937.6	1,040.3	1,120.1	1,031.1	1,097.3	1,188.8	937.6	1,031.1
Noncontrolling Interest
Balance	131.2	127.3	125.6	125.9	134.4	133.2	125.6	133.2
Net earnings (loss)	3.4	3.9	3.6	3.9	3.3	1.2
Other comprehensive (loss) income	0.0	0.0	0.0	0.0	0.0	0.0
Transfers to the Former Parent, net		0.0		0.0	0.0
Distribution to the Former Parent in connection with the Separation	0.0
Transfers from the Former Parent, net	0.0		0.0			0.0
Transfer of Net Investment by Former Parent to Additional Paid-in Capital	0.0
Common shares issued, net of withholding tax	0.0
Stock-based compensation	0.0
Cash dividends declared	0.0
Dividends to noncontrolling interests	(1.9)	0.0	(1.9)	0.0	(11.8)	0.0
Balance	$ 132.7	$ 131.2	$ 127.3	$ 129.8	$ 125.9	$ 134.4	$ 132.7	$ 129.8