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Restructuring and Other Costs - Schedule of Restructuring Charges Related to Active Restructuring Initiatives (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost $ 93.7 $ 111.0 $ 39.5
Restructuring and Related Cost, Cost Incurred to Date 403.0    
Restructuring and Related Cost, Expected Cost 405.9    
Net Property, Plant and Equipment [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 25.7 32.6 9.7
Restructuring and Related Cost, Cost Incurred to Date 151.2    
Restructuring and Related Cost, Expected Cost 151.2    
Severance and Other Employee Costs [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 49.6 60.5 9.9
Restructuring and Related Cost, Cost Incurred to Date 174.7    
Restructuring and Related Cost, Expected Cost 174.7    
Equipment and Inventory Relocation Costs [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 3.6 5.8 5.8
Restructuring and Related Cost, Cost Incurred to Date 17.7    
Restructuring and Related Cost, Expected Cost 18.2    
Facility Carrying Costs [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 2.6 4.1 4.2
Restructuring and Related Cost, Cost Incurred to Date 23.0    
Restructuring and Related Cost, Expected Cost 25.1    
Other Costs Related to Restructuring and Other Costs [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 12.2 8.0 9.9
Restructuring and Related Cost, Cost Incurred to Date 36.4    
Restructuring and Related Cost, Expected Cost 36.7    
Corporate, Non-Segment [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 22.7 40.0 5.6
Restructuring and Related Cost, Cost Incurred to Date 68.4    
Restructuring and Related Cost, Expected Cost 68.4    
Corporate, Non-Segment [Member] | Severance and Other Employee Costs [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 21.1 37.5 0.8
Restructuring and Related Cost, Cost Incurred to Date 59.4    
Restructuring and Related Cost, Expected Cost 59.4    
Corporate, Non-Segment [Member] | Other Costs Related to Restructuring and Other Costs [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 1.6 2.5 4.8
Restructuring and Related Cost, Cost Incurred to Date 9.0    
Restructuring and Related Cost, Expected Cost 9.0    
Corrugated Packaging [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 13.8 58.9 11.6
Restructuring and Related Cost, Cost Incurred to Date 174.3    
Restructuring and Related Cost, Expected Cost 176.9    
Corrugated Packaging [Member] | Net Property, Plant and Equipment [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 2.2 32.1 2.9
Restructuring and Related Cost, Cost Incurred to Date 96.3    
Restructuring and Related Cost, Expected Cost 96.3    
Corrugated Packaging [Member] | Severance and Other Employee Costs [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 8.7 16.9 1.9
Restructuring and Related Cost, Cost Incurred to Date 43.2    
Restructuring and Related Cost, Expected Cost 43.2    
Corrugated Packaging [Member] | Equipment and Inventory Relocation Costs [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 2.2 4.8 3.4
Restructuring and Related Cost, Cost Incurred to Date 10.4    
Restructuring and Related Cost, Expected Cost 10.9    
Corrugated Packaging [Member] | Facility Carrying Costs [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 2.6 3.9 3.3
Restructuring and Related Cost, Cost Incurred to Date 21.1    
Restructuring and Related Cost, Expected Cost 23.2    
Corrugated Packaging [Member] | Other Costs Related to Restructuring and Other Costs [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost (1.9) 1.2 0.1
Restructuring and Related Cost, Cost Incurred to Date 3.3    
Restructuring and Related Cost, Expected Cost 3.3    
Consumer Packaging [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 55.2 12.0 19.0
Restructuring and Related Cost, Cost Incurred to Date 139.7    
Restructuring and Related Cost, Expected Cost 140.0    
Consumer Packaging [Member] | Net Property, Plant and Equipment [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 23.5 0.5 6.8
Restructuring and Related Cost, Cost Incurred to Date 53.1    
Restructuring and Related Cost, Expected Cost 53.1    
Consumer Packaging [Member] | Severance and Other Employee Costs [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 19.8 6.0 6.9
Restructuring and Related Cost, Cost Incurred to Date 58.3    
Restructuring and Related Cost, Expected Cost 58.3    
Consumer Packaging [Member] | Equipment and Inventory Relocation Costs [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 1.4 1.0 2.4
Restructuring and Related Cost, Cost Incurred to Date 7.3    
Restructuring and Related Cost, Expected Cost 7.3    
Consumer Packaging [Member] | Facility Carrying Costs [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost   0.2 0.9
Restructuring and Related Cost, Cost Incurred to Date 1.9    
Restructuring and Related Cost, Expected Cost 1.9    
Consumer Packaging [Member] | Other Costs Related to Restructuring and Other Costs [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 10.5 4.3 2.0
Restructuring and Related Cost, Cost Incurred to Date 19.1    
Restructuring and Related Cost, Expected Cost 19.4    
Land and Development [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 2.0 0.1 3.3
Restructuring and Related Cost, Cost Incurred to Date 20.6    
Restructuring and Related Cost, Expected Cost 20.6    
Land and Development [Member] | Net Property, Plant and Equipment [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Cost Incurred to Date 1.8    
Restructuring and Related Cost, Expected Cost 1.8    
Land and Development [Member] | Severance and Other Employee Costs [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost   $ 0.1 0.3
Restructuring and Related Cost, Cost Incurred to Date 13.8    
Restructuring and Related Cost, Expected Cost 13.8    
Land and Development [Member] | Other Costs Related to Restructuring and Other Costs [Member]      
Restructuring Cost And Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 2.0   $ 3.0
Restructuring and Related Cost, Cost Incurred to Date 5.0    
Restructuring and Related Cost, Expected Cost $ 5.0