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Income Taxes - Deferred Tax Liabilities (Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]    
Excess book basis over tax basis of property, plant and equipment $ 873.9 $ 798.4
Investment in AmeriGas Partners 323.2 321.4
Intangible assets and goodwill 87.1 87.1
Utility regulatory assets 148.3 117.4
Other 11.9 8.9
Gross deferred tax liabilities 1,444.4 1,333.2
Pension plan liabilities (79.7) (59.1)
Employee-related benefits (63.1) (57.6)
Operating loss carryforwards (31.5) (32.5)
Foreign tax credit carryforwards (105.1) (113.8)
Utility regulatory liabilities (13.9) (24.0)
Derivative instruments (14.7) (11.4)
Utility environmental liabilities (22.8) (6.0)
Other (28.3) (17.4)
Gross deferred tax assets (359.1) (321.8)
Deferred tax assets valuation allowance 114.3 131.3
Net deferred tax liabilities $ 1,199.6 $ 1,142.7