Related Party Transactions - Schedule of Other Related Party Balances (Parenthetical) (Details) $ in Millions	Dec. 31, 2015 USD ($)
Related Party Transactions [Abstract]
Accrued interest, related parties	$ 1.3
Fuel accrual, related parties	1.2
FERC accrual, related parties	0.6
Other accrued liabilities, related parties	$ 0.5