Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Cash Flows [Abstract]
Interest Expense Debt To Affiliates	$ 0.2	$ 0.2	$ 0.6	$ 0.6