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Income Taxes - Income Before Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]      
Domestic $ 518.9 $ 552.3 $ 699.2
Foreign 191.1 39.5 68.6
Income before income taxes $ 710.0 $ 591.8 [1] $ 767.8 [1]
[1] Restated to reflect (1) the current-year changes in the presentation of our UGI Utilities and Energy Services reportable segments and (2) the adoption of new accounting guidance related to debt issuance costs (see Note 2 and Note 3).