CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY ( UNAUDITED ) (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Other comprehensive income (loss), net of tax:
Dividends: declared and paid (in dollars per share)	$ 0.69	$ 0.60
Repurchase Class A Common shares (in shares)	3,986,275	10,302,935
Exercise of employee stock options: shares issued (in shares)	176,859	905,520
Other stock-based compensation, net: shares issued (in shares)	399,025	443,956
Other stock-based compensation, net: shares repurchased (in shares)	130,684	151,526