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Equity Affiliates (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Schedule of Equity Method Investments [Line Items]      
Impact of new tax law on equity affiliate expense   $ 32.5  
Equity method investment impairment charge   $ 0.0 $ 79.5
Abdullah Hashim Industrial Gas & Equipment Co. Ltd      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage of equity affiliate 25.00%   25.00%
Equity method investment impairment charge $ 79.5