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Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended			17 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	May 24, 2017	Dec. 18, 2015
Related Party Transactions
Contribution from parent			$ 20.3
Repurchase of management units			8.8
Income tax (expense) benefit	$ 1.5	$ (65.1)	(158.3)
Avista and Crestview, majority unit holders of the Parent of the reporting unit
Related Party Transactions
Quarterly management fees base rate				$ 0.4
Percentage of management fees					50.00%
Payment of management fees	$ 0.0	$ 0.0	1.0
Former Parent of the reporting entity \| Purchase of units from former employees
Related Party Transactions
Repurchase of management units			$ 8.8
Former Parent of the reporting entity \| Purchase of units from former employees \| Class A
Related Party Transactions
Repurchase of old management units (in units)			415,494
Former Parent of the reporting entity \| Purchase of units from former employees \| Class B units
Related Party Transactions
Repurchase of old management units (in units)			243,270