Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Cash Flows [Abstract]
Interest Expense Debt To Affiliates	$ 0.3	$ 0.3	$ 0.5	$ 0.5