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Business Acquisitions, Goodwill and Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2012
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Business Acquisitions, Goodwill, and Intangible Assets      
Number of business acquisitions 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 acquired 17.1 20.1 1.9
Other current assets 256.2 41.5 7.8
Goodwill 72.7 72.6 10.5
Intangible assets 11.9 9.4 1.5
Other non-current assets 16.5 8.6 3.3
Current liabilities (274.1) (54.9) (8.8)
Noncurrent liabilities (11.8) (15.3) (0.8)
Net assets acquired $ 88.5 $ 82.0 $ 15.4