Basis of Presentation and Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2020

Accounting Policies [Abstract]

Schedule of Goodwill [Table Text Block]

The following table summarizes the goodwill of our various reporting units (in millions):

			Impairment during the Three Months Ended
	December 31, 2019		March 31, 2020		March 31, 2020
Gathering and Processing
Arrow	$	45.9	$	—	$	45.9
Powder River Basin	80.3		80.3		—
Marketing, Supply and Logistics
NGL Marketing and Logistics	92.7		—		92.7
Total	$	218.9	$	80.3	$	138.6