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Shareholders' Equity
 12 Months Ended
Dec. 31, 2016
Stockholders' Equity Note [Abstract]  
Shareholders' equity
Shareholders’ equity

Our declared quarterly cash dividends totaled $122.2 million, $117.9 million, and $86.4 million in 2016, 2015, and 2014, respectively. Under the share repurchase program authorized by our Board of Directors, we repurchased 30.9 million, 21.2 million, and 12.9 million shares in 2016, 2015, and 2014, respectively, for a total of $600.0 million, $433.7 million, and $245.8 million in 2016, 2015, and 2014, respectively. At December 31, 2016, we had remaining authorization to repurchase $1.0 billion of common shares.

Under our stock-based compensation plans, we accept shares as payment under certain conditions related to stock option exercises and vesting of restricted shares and share units, generally related to the payment of tax obligations. During 2016, 2015, and 2014, employees surrendered shares valued at $3.2 million, $9.0 million, and $7.2 million, respectively, under these plans. Such share transactions are excluded from the above noted share repurchase authorization