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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 14, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract]          
Federal statutory rate   21.00% 35.00% 21.00% 35.00%
State income tax (net of federal tax effect)   (6.30%) (3.40%) 0.40% 0.30%
Percentage depletion in excess of cost   (0.50%) (0.90%) (0.40%) (0.60%)
Accounting for uncertain tax positions adjustment   0.00% (0.60%) 0.00% (0.20%)
Noncontrolling interest   (1.30%) (3.00%) (1.10%) (1.90%)
IRC 172(f) carryback claim       0.00% (1.00%)
Tax credits   (5.30%) (1.60%) (2.60%) (1.60%)
Effective tax rate adjustment   0.00% 3.90% 0.00% 0.30%
Flow-through adjustments   (1.50%) (1.60%) (0.80%) (1.20%)
TCJA change in estimate   17.60% 0.00% 4.30% 0.00%
AFUDC equity   (0.10%) 0.00% (0.10%) 0.00%
Jurisdictional simplification project       (28.10%) 0.00%
Other tax differences   1.90% 1.30% 0.70% 0.30%
Effective Tax Rate   25.50% 29.10% (6.70%) 29.40%
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 49.90%        
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount   $ 5.3   $ 7.5