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Restructuring and Other Costs - Schedule of Restructuring Charges Related to Active Restructuring Initiatives (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost $ 7.4 $ 6.4 $ 40.1 $ 56.4
Restructuring and Related Cost, Cost Incurred to Date 349.4   349.4  
Restructuring and Related Cost, Expected Cost 352.7   352.7  
Net Property, Plant and Equipment [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost (0.3) (1.7) 2.7 5.2
Restructuring and Related Cost, Cost Incurred to Date 128.2   128.2  
Restructuring and Related Cost, Expected Cost 128.2   128.2  
Severance and Other Employee Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 5.2 5.2 30.8 38.6
Restructuring and Related Cost, Cost Incurred to Date 155.8   155.8  
Restructuring and Related Cost, Expected Cost 155.8   155.8  
Equipment and Inventory Relocation Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 0.2 1.8 1.6 3.9
Restructuring and Related Cost, Cost Incurred to Date 15.8   15.8  
Restructuring and Related Cost, Expected Cost 17.0   17.0  
Facility Carrying Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 0.4 0.8 1.4 2.8
Restructuring and Related Cost, Cost Incurred to Date 21.8   21.8  
Restructuring and Related Cost, Expected Cost 22.5   22.5  
Other Costs Related to Restructuring and Other Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 1.9 0.3 3.6 5.9
Restructuring and Related Cost, Cost Incurred to Date 27.8   27.8  
Restructuring and Related Cost, Expected Cost 29.2   29.2  
Corporate, Non-Segment [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 0.7 2.5 10.3 24.4
Restructuring and Related Cost, Cost Incurred to Date 56.0   56.0  
Restructuring and Related Cost, Expected Cost 56.0   56.0  
Corporate, Non-Segment [Member] | Severance and Other Employee Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 0.1 2.4 9.0 22.2
Restructuring and Related Cost, Cost Incurred to Date 47.3   47.3  
Restructuring and Related Cost, Expected Cost 47.3   47.3  
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 0.6 0.1 1.3 2.2
Restructuring and Related Cost, Cost Incurred to Date 8.7   8.7  
Restructuring and Related Cost, Expected Cost 8.7   8.7  
Corrugated Packaging [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 3.6 1.8 12.4 23.3
Restructuring and Related Cost, Cost Incurred to Date 173.0   173.0  
Restructuring and Related Cost, Expected Cost 174.6   174.6  
Corrugated Packaging [Member] | Net Property, Plant and Equipment [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost (0.3) (1.9) 2.2 5.2
Restructuring and Related Cost, Cost Incurred to Date 96.3   96.3  
Restructuring and Related Cost, Expected Cost 96.3   96.3  
Corrugated Packaging [Member] | Severance and Other Employee Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 3.2 1.6 6.8 12.3
Restructuring and Related Cost, Cost Incurred to Date 41.3   41.3  
Restructuring and Related Cost, Expected Cost 41.3   41.3  
Corrugated Packaging [Member] | Equipment and Inventory Relocation Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 0.2 1.6 1.5 3.0
Restructuring and Related Cost, Cost Incurred to Date 9.8   9.8  
Restructuring and Related Cost, Expected Cost 10.5   10.5  
Corrugated Packaging [Member] | Facility Carrying Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 0.4 0.6 1.4 2.6
Restructuring and Related Cost, Cost Incurred to Date 19.9   19.9  
Restructuring and Related Cost, Expected Cost 20.6   20.6  
Corrugated Packaging [Member] | Other Costs Related to Restructuring and Other Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 0.1 (0.1) 0.5 0.2
Restructuring and Related Cost, Cost Incurred to Date 5.7   5.7  
Restructuring and Related Cost, Expected Cost 5.9   5.9  
Consumer Packaging [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 3.1 2.1 17.4 8.6
Restructuring and Related Cost, Cost Incurred to Date 101.8   101.8  
Restructuring and Related Cost, Expected Cost 103.5   103.5  
Consumer Packaging [Member] | Net Property, Plant and Equipment [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost   0.2 0.5  
Restructuring and Related Cost, Cost Incurred to Date 30.1   30.1  
Restructuring and Related Cost, Expected Cost 30.1   30.1  
Consumer Packaging [Member] | Severance and Other Employee Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 1.9 1.2 15.0 4.0
Restructuring and Related Cost, Cost Incurred to Date 53.4   53.4  
Restructuring and Related Cost, Expected Cost 53.4   53.4  
Consumer Packaging [Member] | Equipment and Inventory Relocation Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost   0.2 0.1 0.9
Restructuring and Related Cost, Cost Incurred to Date 6.0   6.0  
Restructuring and Related Cost, Expected Cost 6.5   6.5  
Consumer Packaging [Member] | Facility Carrying Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost   0.2   0.2
Restructuring and Related Cost, Cost Incurred to Date 1.9   1.9  
Restructuring and Related Cost, Expected Cost 1.9   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 1.2 $ 0.3 1.8 3.5
Restructuring and Related Cost, Cost Incurred to Date 10.4   10.4  
Restructuring and Related Cost, Expected Cost 11.6   11.6  
Land and Development [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost       0.1
Restructuring and Related Cost, Cost Incurred to Date 18.6   18.6  
Restructuring and Related Cost, Expected Cost 18.6   18.6  
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   1.8  
Restructuring and Related Cost, Expected Cost 1.8   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
Restructuring and Related Cost, Cost Incurred to Date 13.8   13.8  
Restructuring and Related Cost, Expected Cost 13.8   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, Cost Incurred to Date 3.0   3.0  
Restructuring and Related Cost, Expected Cost $ 3.0   $ 3.0