Unfavorable Contracts Liability - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Unfavorable Contracts Liability [Abstract]
Percentage of retail rate charged to affiliates	60.00%
Unfavorable contract liability amortization period	5 years
Amortization into Wholesale revenue			$ 25.2
Amortization into Affiliate revenue share	$ 0.0	$ 5.8