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Shareholders' Equity
12 Months Ended
Dec. 31, 2015
Stockholders' Equity Note [Abstract]  
Shareholders' equity
Shareholders’ equity

We reinstated our quarterly cash dividend in July 2013 and subsequently raised the quarterly dividend in both 2014 and 2015. Our declared quarterly cash dividends totaled $117.9 million, $86.4 million, and $57.5 million in 2015, 2014, and 2013, respectively. Under the share repurchase program authorized by our Board of Directors, we repurchased 21.2 million, 12.9 million, and $7.2 million shares in 2015, 2014, and 2013, respectively, for a total of $433.7 million, $245.8 million, and $118.1 million in 2015, 2014, and 2013, respectively. At December 31, 2015, we had remaining authorization to repurchase $604.8 million 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 stock, generally related to the payment of minimum tax obligations. During 2015, 2014, and 2013, employees surrendered shares valued at $9.0 million, $7.2 million, and $9.6 million, respectively, under these plans. Such share transactions are excluded from the above noted share repurchase authorization