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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Leases, additional disclosures      
Rent expense for all leases $ 210.4 $ 225.4 $ 237.4
Amounts payable under non-cancelable operating lease commitments      
2016 154.8    
2017 126.4    
2018 102.6    
2019 86.1    
Thereafter 234.7    
Total 886.0    
2015 $ 181.4