Related Party Transactions - Schedule of Condensed Combined Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Related Party Transactions [Abstract]
Operations and maintenance – related parties	$ 14.0	$ 13.0
General and administrative – related parties	11.0	13.0
Allocated operating expenses	7.0	8.0
Allocated general corporate expenses	5.0	4.0
Management Agreement fee	2.0	2.0
Omnibus Agreement fee	$ 3.0	$ 2.0