Loss Per Share - Narrative (Details) - shares		12 Months Ended
	May 03, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class A Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)		0.0	3,900,000	400,000
Class B
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)		106,600,000	109,000,000.0	117,000,000.0
Class B Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)		5,200,000	6,400,000	7,400,000
Restricted Awards And Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)		800,000	500,000	300,000
Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)		1,100,000	900,000	800,000
Class A | IPO
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Sale of stock, number of shares issued in transaction (in shares)	15,000,000.0