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Business Segment and Geographic Information (Narratives) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]                      
Export sales to third-party customers                 $ 398.8 $ 378.7 $ 410.3
Sales $ 2,449.4 $ 2,470.2 $ 2,414.5 $ 2,560.8 $ 2,677.0 $ 2,634.6 $ 2,581.9 $ 2,545.5 9,894.9 10,439.0 10,180.4
Industrial Gases - Global [Member]                      
Segment Reporting Information [Line Items]                      
Sales                 286.8 296.0 309.0
Industrial Gases - Global [Member] | Intersegment Elimination [Member]                      
Segment Reporting Information [Line Items]                      
Sales                 $ 242.8 $ 192.4 $ 183.9