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Note 3 - Acquisitions and Divestitures - Unaudited Pro Forma Results (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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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

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