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Restructuring and related charges - Summarization of Remaining Accrual Balance Associated with Initiatives and Activity (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Restructuring Reserve [Roll Forward]      
Accrual Balance at September 30, 2012 $ 6.6    
Provisions 20.8    
Cash Expenditures (7.5)    
Non-Cash Items (3.2) (5.2) (15.1)
Accrual Balance at September 30, 2013 16.7 6.6  
Expensed as Incurred 13.2 [1]    
Global Expense Rationalization Initiatives
      
Restructuring Reserve [Roll Forward]      
Accrual Balance at September 30, 2012 0    
Provisions 9.0    
Cash Expenditures (2.1)    
Non-Cash Items 0.4    
Accrual Balance at September 30, 2013 7.3    
Expensed as Incurred 2.3 [1]    
Global Cost Reduction Initiatives
      
Restructuring Reserve [Roll Forward]      
Accrual Balance at September 30, 2012 4.4    
Provisions 5.8    
Cash Expenditures (4.9)    
Non-Cash Items 0    
Accrual Balance at September 30, 2013 5.3    
Expensed as Incurred 10.6 [1]    
Other initiatives
      
Restructuring Reserve [Roll Forward]      
Accrual Balance at September 30, 2012 2.2    
Provisions 6.0    
Cash Expenditures (0.5)    
Non-Cash Items (3.6)    
Accrual Balance at September 30, 2013 4.1    
Expensed as Incurred 0.3 [1]    
Termination benefits | Global Expense Rationalization Initiatives
      
Restructuring Reserve [Roll Forward]      
Accrual Balance at September 30, 2012 0    
Provisions 9.0    
Cash Expenditures (2.1)    
Non-Cash Items 0.4    
Accrual Balance at September 30, 2013 7.3    
Expensed as Incurred 1.3 [1]    
Termination benefits | Global Cost Reduction Initiatives
      
Restructuring Reserve [Roll Forward]      
Accrual Balance at September 30, 2012 3.3    
Provisions 5.3    
Cash Expenditures (3.7)    
Non-Cash Items 0    
Accrual Balance at September 30, 2013 4.9    
Expensed as Incurred 1.3 [1]    
Other costs | Global Expense Rationalization Initiatives
      
Restructuring Reserve [Roll Forward]      
Accrual Balance at September 30, 2012 0    
Provisions 0    
Cash Expenditures 0    
Non-Cash Items 0    
Accrual Balance at September 30, 2013 0    
Expensed as Incurred 1.0 [1]    
Other costs | Global Cost Reduction Initiatives
      
Restructuring Reserve [Roll Forward]      
Accrual Balance at September 30, 2012 1.1    
Provisions 0.5    
Cash Expenditures (1.2)    
Non-Cash Items 0    
Accrual Balance at September 30, 2013 0.4    
Expensed as Incurred $ 9.3 [1]    
[1] Consists of amounts not impacting the accrual for restructuring and related charges.