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Restructuring and related charges - Summarization of Restructuring and Related Charges (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 34.0 $ 19.6 $ 28.6
Consumer products cost of goods sold classification
      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 10.0 9.8 7.8
Selling, acquisition, operating and general expenses classification
      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 24.0 9.8 20.8
Global Cost Reduction Initiatives
      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 11.3 0 0
Charges Since Inception 11.3    
Expected Future Charges 4.2    
Total Projected Costs 15.5    
Expected Completion Date Sep. 30, 2015    
Global Expense Rationalization Initiatives
      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 16.4 18.7 25.5
Charges Since Inception 99.4    
Expected Future Charges 3.0    
Total Projected Costs 102.4    
Expected Completion Date Jan. 31, 2015    
Other initiatives
      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 6.3 $ 0.9 $ 3.1