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Shareholders' Equity
 6 Months Ended
Jun. 30, 2016
Stockholders' Equity Note [Abstract]  
Shareholders’ equity
Shareholders’ equity

During the six months ended June 30, 2016, we declared cash dividends totaling $62.7 million and repurchased 5.6 million shares under our repurchase authorization for a total of $97.7 million. During the six months ended June 30, 2015, we declared cash dividends totaling $58.2 million and repurchased 15.3 million shares under our repurchase authorization for a total of $313.0 million. At June 30, 2016, we had remaining authorization to repurchase $507.1 million of common shares. On July 20, 2016, our Board of Directors approved a $1.0 billion increase in our share repurchase authorization, raising our total authorization to $1.5 billion. We plan to repurchase $250.0 million of shares in each of the third and fourth quarters of 2016 and $1.0 billion of shares in 2017.

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. During the six months ended June 30, 2016 and 2015, employees surrendered shares valued at $3.1 million and $9.0 million, respectively, under these plans. Such share transactions are excluded from the above noted share repurchase authorization.