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Note 3 - Acquisitions and Divestitures - Unaudited Pro Forma Results (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
Revenue (less agency commissions) $ 3,153
Net income 199
Net income attributable to common stockholders $ 147
Basic net income attributable to common stockholders, per share (in dollars per share) | $ / shares $ 1.55
Diluted net income attributable to common stockholders, per share (in dollars per share) | $ / shares $ 1.55