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Equity Affiliates (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Schedule of Equity Method Investments [Line Items]      
Equity method investment impairment charge   $ 79.5 $ 0.0
Abdullah Hashim Industrial Gas & Equipment Co. Ltd [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage of equity affiliate 25.00% 25.00%  
Equity method investment impairment charge $ 79.5 $ 79.5 [1]  
Equity method investments $ 68.5 $ 68.5  
[1] We assessed the recoverability of the carrying value of our equity investment in AHG. We estimated the fair value of our investment using weighting of the results of the income and market approaches. An impairment loss was recognized for the difference between the carrying amount and the fair value of the investment as of 30 June 2017. For additional information, see Note 7, Equity Affiliates.