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Acquisitions (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
acquisition
Business Acquisition [Line Items]      
Business combinations, goodwill acquired during period   $ 38.0  
ACP Europe SA      
Business Acquisition [Line Items]      
Business combinations, aggregate purchase price, net of cash acquired $ 106.3    
Business combinations, plant and equipment acquired during the period 74.6 74.6  
Business combinations, goodwill acquired during period 38.0    
Business combinations, tax deductible goodwill $ 0.0 $ 0.0  
2018 Business Combinations      
Business Acquisition [Line Items]      
Business combinations, aggregate purchase price, net of cash acquired     $ 281.0
Number of acquisitions completed | acquisition     5