Earnings (Loss) Per Share - Anti-dilutive Securities (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share
Weighted-average securities not included in computation of diluted shares outstanding (in shares)	4.1	7.9	15.6
Shares issuable for contingent consideration
Antidilutive Securities Excluded from Computation of Earnings Per Share
Weighted-average securities not included in computation of diluted shares outstanding (in shares)	0.0	3.6	7.8
Shares issuable upon conversion of the shares of common stock of PDH
Antidilutive Securities Excluded from Computation of Earnings Per Share
Weighted-average securities not included in computation of diluted shares outstanding (in shares)	0.0	0.0	4.1
Shares issuable upon conversion of Series A Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Weighted-average securities not included in computation of diluted shares outstanding (in shares)	0.0	0.0	2.0
Shares issuable upon vesting of RSUs and exercise of stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Weighted-average securities not included in computation of diluted shares outstanding (in shares)	4.1	4.3	1.7