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Shareholders' Equity	12 Months Ended
Shareholders' Equity	Dec. 31, 2018
Stockholders' Equity Note [Abstract]
Shareholders' equity	Shareholders’ equity Our declared quarterly cash dividends totaled $108.5 million, $110.0 million, and $122.2 million in 2018, 2017, and 2016, respectively. Under a share repurchase program authorized by our Board of Directors, we repurchased 10.9 million, 35.4 million, and 30.9 million shares in 2018, 2017, and 2016, respectively, for a total of $294.6 million, $910.3 million, and $600.0 million in 2018, 2017, and 2016, respectively. At December 31, 2018, we had remaining authorization to repurchase $299.9 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 shares and share units, generally related to the payment of tax obligations. During 2018, 2017, and 2016, employees surrendered shares valued at $7.9 million, $6.0 million, and $3.2 million, respectively, under these plans. Such share transactions are excluded from the above noted share repurchase authorization.