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Business Acquisitions, Goodwill and Intangible Assets (Details 2) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Consideration for acquisitions      
Consideration paid in cash $ 70.2 $ 62.1 $ 14.5
Senior notes assumed in acquisition as part of consideration 18.3 5.6  
Equity issued   14.3 0.9
Total consideration $ 88.5 82.0 15.4
Maximum period to determine final value of identifiable intangible assets 12 months    
Acquired intangible assets $ 11.9 9.4 1.5
Contractual Rights [Member]      
Consideration for acquisitions      
Acquired intangible assets 5.8 4.2 0.7
Backlog and customer relationship      
Consideration for acquisitions      
Acquired intangible assets 4.6 $ 5.2 $ 0.8
Trademark / tradename      
Consideration for acquisitions      
Acquired intangible assets $ 1.5