CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY ( UNAUDITED ) (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Other comprehensive income (loss), net of tax:
Dividends: declared and paid (in dollars per share)	$ 0.50	$ 0.46
Repurchase of Class A Common shares (in shares)	0	3,986,275
Exercise of employee share options: shares issued (in shares)	169,775	172,959
Other share-based compensation, net: shares issued (in shares)	230,094	331,530
Other share-based compensation, net: shares repurchased (in shares)	67,610	108,626