Basis of Presentation Restricted Cash (Tables)

6 Months Ended

Jun. 30, 2019

Restricted Cash [Abstract]

Restrictions on Cash and Cash Equivalents [Table Text Block]

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Condensed Consolidated Balance Sheets to the amounts shown in the Condensed Consolidated Statements of Cash Flows:

	June 30,
	2019		2018
	(in millions)
Cash and cash equivalents	$	97.1	$	—
Restricted cash(1)	29.2		26.1
Total cash, cash equivalents and restricted cash shown in the Condensed Consolidated Statements of Cash Flows	$	126.3	$	26.1

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⁽¹⁾ As of June 30, 2019 and 2018, the restricted cash balance is cash held in an escrow account related to a title dispute between outside parties in the Williston Basin, and the restricted cash balance is recorded within "Other noncurrent assets" on the Condensed Consolidated Balance Sheet