Earnings Per Share - Anti-dilutive Securities (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share
Weighted-average securities not included in computation of diluted shares outstanding (in shares)	4.1	5.6	4.2	5.6
Shares issuable for the 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	5.0	0.0	5.1
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	0.6	4.2	0.5