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Restructuring and Other Costs - Schedule of Restructuring Charges Related to Active Restructuring Initiatives (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost $ 24.3 $ 21.2 $ 50.0 $ 25.6
Restructuring and Related Cost, Cost Incurred to Date 578.8   578.8  
Restructuring and Related Cost, Expected Cost 588.0   588.0  
Net Property, Plant and Equipment [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 3.8 3.7 6.9 5.3
Restructuring and Related Cost, Cost Incurred to Date 246.2   246.2  
Restructuring and Related Cost, Expected Cost 246.2   246.2  
Severance and Other Employee Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 12.8 6.7 33.4 6.5
Restructuring and Related Cost, Cost Incurred to Date 225.5   225.5  
Restructuring and Related Cost, Expected Cost 226.1   226.1  
Equipment and Inventory Relocation Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 1.4 2.7 2.1 4.6
Restructuring and Related Cost, Cost Incurred to Date 15.1   15.1  
Restructuring and Related Cost, Expected Cost 17.6   17.6  
Facility Carrying Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 1.1 1.2 2.0 2.4
Restructuring and Related Cost, Cost Incurred to Date 32.7   32.7  
Restructuring and Related Cost, Expected Cost 34.3   34.3  
Other Costs Related to Restructuring and Other Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 5.2 6.9 5.6 6.8
Restructuring and Related Cost, Cost Incurred to Date 59.3   59.3  
Restructuring and Related Cost, Expected Cost 63.8   63.8  
Corporate, Non-Segment [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 7.8 4.3 21.9 5.0
Restructuring and Related Cost, Cost Incurred to Date 139.5   139.5  
Restructuring and Related Cost, Expected Cost 139.5   139.5  
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 5.6 (0.1) 19.8 0.1
Restructuring and Related Cost, Cost Incurred to Date 120.5   120.5  
Restructuring and Related Cost, Expected Cost 120.5   120.5  
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 2.2 4.4 2.1 4.9
Restructuring and Related Cost, Cost Incurred to Date 17.6   17.6  
Restructuring and Related Cost, Expected Cost 17.6   17.6  
Corrugated Packaging [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 10.3 4.3 21.5 8.0
Restructuring and Related Cost, Cost Incurred to Date 311.5   311.5  
Restructuring and Related Cost, Expected Cost 319.0   319.0  
Corrugated Packaging [Member] | Net Property, Plant and Equipment [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 4.0 0.3 7.1 0.9
Restructuring and Related Cost, Cost Incurred to Date 205.2   205.2  
Restructuring and Related Cost, Expected Cost 205.2   205.2  
Corrugated Packaging [Member] | Severance and Other Employee Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 4.1 1.3 10.7 2.4
Restructuring and Related Cost, Cost Incurred to Date 53.1   53.1  
Restructuring and Related Cost, Expected Cost 53.5   53.5  
Corrugated Packaging [Member] | Equipment and Inventory Relocation Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 1.0 1.6 1.4 3.1
Restructuring and Related Cost, Cost Incurred to Date 9.1   9.1  
Restructuring and Related Cost, Expected Cost 10.6   10.6  
Corrugated Packaging [Member] | Facility Carrying Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 0.9 1.0 2.0 1.8
Restructuring and Related Cost, Cost Incurred to Date 30.7   30.7  
Restructuring and Related Cost, Expected Cost 32.3   32.3  
Corrugated Packaging [Member] | Other Costs Related to Restructuring and Other Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 0.3 0.1 0.3 (0.2)
Restructuring and Related Cost, Cost Incurred to Date 13.4   13.4  
Restructuring and Related Cost, Expected Cost 17.4   17.4  
Consumer Packaging [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 6.0 12.4 6.5 12.0
Restructuring and Related Cost, Cost Incurred to Date 109.2   109.2  
Restructuring and Related Cost, Expected Cost 110.9   110.9  
Consumer Packaging [Member] | Net Property, Plant and Equipment [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost (0.2) 3.4 (0.2) 4.4
Restructuring and Related Cost, Cost Incurred to Date 37.8   37.8  
Restructuring and Related Cost, Expected Cost 37.8   37.8  
Consumer Packaging [Member] | Severance and Other Employee Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 2.9 5.3 2.8 3.4
Restructuring and Related Cost, Cost Incurred to Date 38.1   38.1  
Restructuring and Related Cost, Expected Cost 38.3   38.3  
Consumer Packaging [Member] | Equipment and Inventory Relocation Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 0.4 1.1 0.7 1.5
Restructuring and Related Cost, Cost Incurred to Date 6.0   6.0  
Restructuring and Related Cost, Expected Cost 7.0   7.0  
Consumer Packaging [Member] | Facility Carrying Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 0.2 0.2   0.6
Restructuring and Related Cost, Cost Incurred to Date 2.0   2.0  
Restructuring and Related Cost, Expected Cost 2.0   2.0  
Consumer Packaging [Member] | Other Costs Related to Restructuring and Other Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 2.7 2.4 3.2 2.1
Restructuring and Related Cost, Cost Incurred to Date 25.3   25.3  
Restructuring and Related Cost, Expected Cost 25.8   25.8  
Land and Development [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and Related Cost, Incurred Cost 0.2 0.2 0.1 0.6
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 0.2 $ 0.2 0.1 $ 0.6
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