Consolidated Statement of Changes in Members' Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020		Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Stockholders' Equity [Abstract]
Income tax (benefit)	$ 0.5	[1]	$ (4.0)	$ (3.6)	$ (3.5)	$ (3.6)

[1] Includes a tax expense of $0.5 million and a tax benefit of $3.5 million for the three and six months ended June 30, 2020, respectively, and a tax benefit of $3.6 million for the three and six months ended June 30, 2019, respectively.