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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost $ 6.4 $ 6.9 $ 56.4 $ 32.5
Restructuring and Related Cost, Cost Incurred to Date 585.4   585.4  
Restructuring and Related Cost, Expected Cost 591.5   591.5  
Net Property, Plant and Equipment [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost (1.7) 2.2 5.2 7.5
Restructuring and Related Cost, Cost Incurred to Date 244.6   244.6  
Restructuring and Related Cost, Expected Cost 244.6   244.6  
Severance and Other Employee Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 5.2 2.5 38.6 9.0
Restructuring and Related Cost, Cost Incurred to Date 230.6   230.6  
Restructuring and Related Cost, Expected Cost 230.8   230.8  
Equipment and Inventory Relocation Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 1.8 0.6 3.9 5.2
Restructuring and Related Cost, Cost Incurred to Date 16.9   16.9  
Restructuring and Related Cost, Expected Cost 18.4   18.4  
Facility Carrying Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 0.8 0.9 2.8 3.3
Restructuring and Related Cost, Cost Incurred to Date 33.6   33.6  
Restructuring and Related Cost, Expected Cost 34.8   34.8  
Other Costs Related to Restructuring and Other Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 0.3 0.7 5.9 7.5
Restructuring and Related Cost, Cost Incurred to Date 59.7   59.7  
Restructuring and Related Cost, Expected Cost 62.9   62.9  
Corporate, Non-Segment [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 2.5 0.8 24.4 5.8
Restructuring and Related Cost, Cost Incurred to Date 142.0   142.0  
Restructuring and Related Cost, Expected Cost 142.0   142.0  
Corporate, Non-Segment [Member] | Net Property, Plant and Equipment [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Cost Incurred to Date 1.4   1.4  
Restructuring and Related Cost, Expected Cost 1.4   1.4  
Corporate, Non-Segment [Member] | Severance and Other Employee Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 2.4 0.9 22.2 1.0
Restructuring and Related Cost, Cost Incurred to Date 122.9   122.9  
Restructuring and Related Cost, Expected Cost 122.9   122.9  
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 0.1 (0.1) 2.2 4.8
Restructuring and Related Cost, Cost Incurred to Date 17.7   17.7  
Restructuring and Related Cost, Expected Cost 17.7   17.7  
Corrugated Packaging [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 1.8 1.4 23.3 9.4
Restructuring and Related Cost, Cost Incurred to Date 313.5   313.5  
Restructuring and Related Cost, Expected Cost 319.3   319.3  
Corrugated Packaging [Member] | Net Property, Plant and Equipment [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost (1.9) 0.4 5.2 1.3
Restructuring and Related Cost, Cost Incurred to Date 203.3   203.3  
Restructuring and Related Cost, Expected Cost 203.3   203.3  
Corrugated Packaging [Member] | Severance and Other Employee Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 1.6 (0.2) 12.3 2.2
Restructuring and Related Cost, Cost Incurred to Date 54.7   54.7  
Restructuring and Related Cost, Expected Cost 54.9   54.9  
Corrugated Packaging [Member] | Equipment and Inventory Relocation Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 1.6 0.3 3.0 3.4
Restructuring and Related Cost, Cost Incurred to Date 10.7   10.7  
Restructuring and Related Cost, Expected Cost 12.2   12.2  
Corrugated Packaging [Member] | Facility Carrying Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 0.6 0.8 2.6 2.6
Restructuring and Related Cost, Cost Incurred to Date 31.4   31.4  
Restructuring and Related Cost, Expected Cost 32.6   32.6  
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 0.2 (0.1)
Restructuring and Related Cost, Cost Incurred to Date 13.4   13.4  
Restructuring and Related Cost, Expected Cost 16.3   16.3  
Consumer Packaging [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 2.1 4.6 8.6 16.6
Restructuring and Related Cost, Cost Incurred to Date 111.3   111.3  
Restructuring and Related Cost, Expected Cost 111.6   111.6  
Consumer Packaging [Member] | Net Property, Plant and Equipment [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 0.2 1.8   6.2
Restructuring and Related Cost, Cost Incurred to Date 38.1   38.1  
Restructuring and Related Cost, Expected Cost 38.1   38.1  
Consumer Packaging [Member] | Severance and Other Employee Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 1.2 1.7 4.0 5.1
Restructuring and Related Cost, Cost Incurred to Date 39.2   39.2  
Restructuring and Related Cost, Expected Cost 39.2   39.2  
Consumer Packaging [Member] | Equipment and Inventory Relocation Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 0.2 0.3 0.9 1.8
Restructuring and Related Cost, Cost Incurred to Date 6.2   6.2  
Restructuring and Related Cost, Expected Cost 6.2   6.2  
Consumer Packaging [Member] | Facility Carrying Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 0.2 0.1 0.2 0.7
Restructuring and Related Cost, Cost Incurred to Date 2.2   2.2  
Restructuring and Related Cost, Expected Cost 2.2   2.2  
Consumer Packaging [Member] | Other Costs Related to Restructuring and Other Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 0.3 0.7 3.5 2.8
Restructuring and Related Cost, Cost Incurred to Date 25.6   25.6  
Restructuring and Related Cost, Expected Cost 25.9   25.9  
Land and Development [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost   0.1 0.1 0.7
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 0.1 $ 0.7
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