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Income Taxes - Deferred Tax Liabilities (Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Sep. 30, 2018
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Income Tax Disclosure [Abstract] |  |
Excess book basis over tax basis of property, plant and equipment | $ 804.5 | $ 807.8
Investment in AmeriGas Partners | 0.0 | 219.2
Utility regulatory assets | 107.6 | 86.7
Intangible assets and goodwill | 70.5 | 67.6
Derivative instruments | 0.0 | 30.4
Other | 8.3 | 10.6
Gross deferred tax liabilities | 990.9 | 1,222.3
Investment in AmeriGas Partners | (303.5) | 0.0
Pension plan liabilities | (49.9) | (20.0)
Employee-related benefits | (43.8) | (43.6)
Operating loss carryforwards | (21.2) | (26.2)
Foreign tax credit carryforwards | (81.4) | (106.1)
Utility regulatory liabilities | (94.3) | (118.6)
Derivative instruments | (15.3) | 0.0
Utility environmental liabilities | (15.3) | (14.7)
Other | (33.4) | (29.0)
Gross deferred tax assets | (658.1) | (358.2)
Deferred tax assets valuation allowance | 90.7 | 116.8
Net deferred tax liabilities | $ 423.5 | $ 980.9

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