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Income Taxes - Deferred Tax Liabilities (Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Excess book basis over tax basis of property, plant and equipment | $ 807.8 | $ 975.8
Investment in AmeriGas Partners | 219.2 | 326.8
Intangible assets and goodwill | 67.6 | 98.2
Utility regulatory assets | 86.7 | 132.2
Derivative instruments | 30.4 | 0.0
Other | 10.6 | 11.7
Gross deferred tax liabilities | 1,222.3 | 1,544.7
Pension plan liabilities | (20.0) | (57.7)
Employee-related benefits | (43.6) | (65.4)
Operating loss carryforwards | (26.2) | (30.9)
Foreign tax credit carryforwards | (106.1) | (106.1)
Utility regulatory liabilities | (118.6) | (9.3)
Derivative instruments | 0.0 | (1.7)
Utility environmental liabilities | (14.7) | (22.2)
Other | (29.0) | (27.8)
Gross deferred tax assets | (358.2) | (321.1)
Deferred tax assets valuation allowance | 116.8 | 107.1
Net deferred tax liabilities | $ 980.9 | $ 1,330.7

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