Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table is a reconciliation of the weighted-average amounts used in calculating loss per share for the years ended December 31:

(Amounts in millions)	2020	2019	2018
Basic and diluted common shares outstanding	77.8	71.1	64.3

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following table summarizes the weighted-average potential common shares excluded from diluted loss per common share as their effect would be anti-dilutive:

(Amounts in millions)	2020	2019	2018
Shares related to stock options	0.3	0.9	1.8
Shares related to restricted stock units	4.5	2.7	2.3
Shares related to Ripple warrants	6.0	1.4	—
Shares excluded from the computation	10.8	5.0	4.1