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Business Acquisitions, Goodwill and Intangible Assets (Details) - Business Acquisition, Acquiree [Domain] - Debt Instrument, Name [Domain] - Range [Domain]
$ in Millions
 12 Months Ended
Sep. 30, 2014
USD ($)
item
Sep. 30, 2013
USD ($)
item
Sep. 30, 2012
USD ($)
item
Business Acquisition [Line Items]      
Consideration paid in cash $ 70.2 $ 62.1 $ 14.5
Consideration paid by issuing stock   14.3 $ 0.9
Senior notes assumed in acquisition as part of consideration $ 18.3 $ 5.6  
Number of business acquisitions | item 2 2 1
Aggregate value of all consideration for acquisitions consummated $ 88.5 $ 82.0 $ 15.4
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions      
Cash and cash equivalents 17.1 20.1 1.9
Goodwill 72.7 72.6 10.5
Other current assets 256.2 41.5 7.8
Total identifiable intangible assets 11.9 9.4 1.5
Current liabilities (274.1) (54.9) (8.8)
Net assets acquired 88.5 82.0 15.4
Other non-current assets 16.5 8.6 3.3
Tax-deductible goodwill 251.6 283.9  
Noncurrent liabilities $ (11.8) $ (15.3) $ (0.8)