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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

_______________________
(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