Segment Information - Reconciliation of Earnings from Operations to Earnings Before Income Tax and Earnings from Unconsolidated Affiliates (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
Segment Reporting [Abstract]
Earnings from operations	$ 67.4	$ 25.2	$ 62.6	$ 37.0
Interest and foreign exchange	21.6	11.8	41.2	24.4
Earnings before income tax and earnings from unconsolidated affiliates	$ 45.8	$ 13.4	$ 21.4	$ 12.6