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Shareholders' Equity
 9 Months Ended
Sep. 30, 2021
Stockholders' Equity Note [Abstract]  
Shareholders’ equity Shareholders’ equity
In the nine months ended September 30, 2021, we declared cash dividends totaling $110.3 million and repurchased 12.0 million shares under our repurchase authorization for $614.3 million. In the nine months ended September 30, 2020, we declared cash dividends totaling $97.5 million and repurchased 2.8 million shares under our repurchase authorization for $95.7 million. On April 26, 2021, the Board of Directors approved an additional share repurchase authorization of $1.0 billion. At September 30, 2021, we had remaining authorization to repurchase $740.6 million of common shares.

Under our share-based compensation plans, we accept shares as payment under certain conditions related to stock option exercises and vesting of shares, generally related to the payment of minimum tax obligations. In the nine months ended September 30, 2021 and 2020, participants surrendered shares valued at $10.6 million and $14.9 million, respectively, under these plans. Such share transactions are excluded from the above noted share repurchase authorization.