XML 175 R157.htm IDEA: XBRL DOCUMENT v3.8.0.1
Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Operating Leased Assets [Line Items]      
Operating Leases, Rent Expense $ 41.8 $ 49.6 $ 40.8
Document Period End Date Sep. 30, 2017    
Commitments and contingencies (Note 21)  
Gross Lease Obligation [Member]      
Operating Leased Assets [Line Items]      
Operating Leases, Future Minimum Payments Due, Next Twelve Months 33.7    
Operating Leases, Future Minimum Payments, Due in Two Years 28.9    
Operating Leases, Future Minimum Payments, Due in Three Years 22.0    
Operating Leases, Future Minimum Payments, Due in Four Years 17.2    
Operating Leases, Future Minimum Payments, Due in Five Years 13.7    
Operating Leases, Future Minimum Payments, Due Thereafter 32.6    
Operating Leases, Future Minimum Payments Due $ 148.1