CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY ( UNAUDITED ) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other comprehensive income (loss), net of tax:
Dividends: declared and paid (in dollars per share)	$ 0.30	$ 0.25
Exercise of employee share options: shares issued (in shares)	262,390	129,671
Other share-based compensation, net: shares issued (in shares)	230,053	197,978
Other share-based compensation, net: shares repurchased (in shares)	78,611	65,540