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Note 3 - Acquisitions and Divestitures - Unaudited Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Revenue (less agency commissions) | $ 1,751 | $ 1,678
Net income | 126 | 153
Net income attributable to common stockholders | $ 87 | $ 114
Basic net income attributable to common stockholders, per share (in dollars per share) | $ 0.93 | $ 1.18
Diluted net income attributable to common stockholders, per share (in dollars per share) | $ 0.92 | $ 1.18

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