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Income Taxes (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Income Taxes |  |  |  |  |  |
Foreign tax credits |  |  | $ 63.0 | $ 12.1 | $ 34.9 |
Undistributed earnings of foreign subsidiaries |  |  | 50.8 |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  | 32.5 | 27.9 |  |
Valuation allowance provided for deferred tax assets related to state net operating loss carryforwards and other state deferred tax assets of certain subsidiaries |  |  | 15.6 |  |  |
Increase (decrease) in valuation allowance |  |  | (72.1) |  |  |
Unrecognized income tax benefits |  |  | 3.2 | 2.4 | 3.4 | $ 2.9
Accrued interest included in unrecognized income tax benefits |  |  | 0.1 |  |  |
Unrecognized tax benefits if recognized would impact the reported effective tax rate |  |  | 3.2 |  |  |
Foreign Tax Credits |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  | 66.0 |  |  |
Foreign Operating Loss Carryforwards |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  | 8.0 |  |  |
State Operating Loss Benefits |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  | (1.9) |  |  |
Accrued Interest Included |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Unrecognized income tax benefits |  |  | 3.2 |  |  |
Foreign Country |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Foreign tax credit carryforwards |  |  | 113.7 |  |  |
State and Local Jurisdiction |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Decrease in income tax expense due to state tax flow through of accelerated depreciation |  |  | 1.5 | 2.0 | $ 1.5 |
Operating loss carryforwards |  |  | 158.5 |  |  |
Deferred tax assets and associated valuation allowance for unrealized state tax benefits for equity compensation deductions |  |  | 6.5 | $ 6.7 |  |
UGI International Holdings |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  | 0.6 |  |  |
AmeriGas Propane |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Operating loss carryforwards |  |  | 12.1 |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  | 4.7 |  |  |
Other Subsidiaries |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  | 8.7 |  |  |
UGI International |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Valuation allowance operating loss carryforwards related to acquisition |  |  | 11.0 |  |  |
Flaga |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  | 13.0 |  |  |
Flaga | Foreign Country |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Operating loss carryforwards |  |  | 59.4 |  |  |
UGI France |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  | 8.0 |  |  |
UGI France | Foreign Country |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Operating loss carryforwards |  |  | $ 23.4 |  |  |
France | Foreign Country |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Income tax expense |  | $ 5.7 |  |  |  |
France | UGI France |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Income tax expense | $ 5.7 |  |  |  |  |

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