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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash, Cash Equivalents and Restricted Cash:
Cash and cash equivalents		$ 30.2	$ 5.1
Restricted cash		248.9	65.2
Total cash, cash equivalents and restricted cash shown in the Unaudited Condensed Statements of Consolidated Cash Flows	$ 99.7	279.1	$ 70.3	$ 417.6
Decrease in restricted cash	$ 287.7
Initial Margin Requirement [Member]
Cash, Cash Equivalents and Restricted Cash:
Restricted cash		58.9
Variation Margin Requirement [Member]
Cash, Cash Equivalents and Restricted Cash:
Restricted cash		$ 190.0