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Business Combinations (Narrative) (Details)
$ in Millions
3 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]    
Number of acquisitions completed 3  
Aggregate purchase price, net of cash acquired $ 237.1 $ 0.0
Business combinations, recognized property, plant, and equipment 148.5  
Business combinations, goodwill acquired during period 53.7  
Business combinations, tax deductible goodwill 3.0  
Business combinations, recognized identifiable intangible assets $ 53.4  
Acquired finite-lived intangible assets, weighted-average useful life 12 years