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Income Taxes - Deferred Tax Liabilities (Assets) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013
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Income Tax Disclosure [Abstract] |  |
Excess book basis over tax basis of property, plant and equipment | $ 675.7 | $ 626.9
Investment in AmeriGas Partners | 325.1 | 313.0
Intangible assets and goodwill | 53.0 | 65.1
Utility regulatory assets | 110.0 | 101.6
Foreign currency translation adjustment | 0 | 9.5
Other | 3.5 | 2.7
Gross deferred tax liabilities | 1,167.3 | 1,118.8
Pension plan liabilities | (40.6) | (36.2)
Employee-related benefits | (48.8) | (47.9)
Operating loss carryforwards | (27.9) | (32.1)
Foreign tax credit carryforwards | (47.8) | (81.8)
Utility regulatory liabilities | (14.8) | (15.5)
Foreign currency translation adjustment | (14.1) | 0
Derivative instruments | (11.0) | (15.0)
Other | (13.0) | (20.5)
Gross deferred tax assets | (218.0) | (249.0)
Deferred tax assets valuation allowance | 59.2 | 97.6
Net deferred tax liabilities | $ 1,008.5 | $ 967.4

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