Segment Information - Additional Information (Details) $ in Millions		3 Months Ended
	Dec. 01, 2022 USD ($)	Dec. 31, 2023 USD ($) Segment	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment		4
Losses at facility in process of closure		$ 9.1
Mexico Acquisition [Member]
Segment Reporting Information [Line Items]
Non-cash pre-tax loss	$ 46.8
Corrugated Packaging [Member]
Segment Reporting Information [Line Items]
Acquisition accounting inventory-related adjustments			$ 3.0
Corrugated Packaging [Member] | Mexico Acquisition [Member]
Segment Reporting Information [Line Items]
Non-cash Pre-tax loss on acquisition			46.8
Consumer Packaging [Member]
Segment Reporting Information [Line Items]
Incremental work stoppage costs			31.3
Global Paper [Member]
Segment Reporting Information [Line Items]
Incremental work stoppage costs			10.3
Acquisition accounting inventory-related adjustments			5.5
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Business systems transformation costs		$ 24.9	$ 20.2