Earnings per Share - Narrative (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Amount of antidilutive securities not included in calculation of earnings per share (in shares)	0.0
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Amount of antidilutive securities not included in calculation of earnings per share (in shares)		2.4	0.1	2.4
Employee Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Amount of antidilutive securities not included in calculation of earnings per share (in shares)			0.1
Warrant
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Amount of antidilutive securities not included in calculation of earnings per share (in shares)		10.5	3.5	10.5