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Business Acquisitions, Goodwill and Intangible Assets (Details 2) (USD $)
In Millions, unless otherwise specified
 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
Customer Relationships [Member]
      
Consideration for acquisitions      
Acquired intangible assets 4.6 5.2 0.8
Trademarks and Trade Names [Member]
      
Consideration for acquisitions      
Acquired intangible assets $ 1.5