CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - 9 months ended Sep. 30, 2015 - USD ($) $ in Thousands	Total	Common Stock and Additional Paid-In Capital	Retained Earnings	Cumulative Translation Adjustment	Retirement Benefits Adjustment	Cumulative Unrealized Gain (Loss) on Derivatives	Treasury Stock
Balance at Dec. 31, 2014	$ 1,486,451	$ 648,451	$ 1,483,821	$ (24,813)	$ (40,316)	$ (27,149)	$ (553,543)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	215,044		215,044
Cumulative translation adjustment	(54,555)			(54,555)
Pension and other postretirement adjustments (net of tax of $1,187)	2,418				2,418
Amortization of forward starting swaps (net of tax of $1,917)	3,370					3,370
Issuance of 557,026 shares of common stock from issuance of unvested shares, exercise of stock options and deferred compensation plans	15,166	9,278					5,888
Excess tax benefit from share-based compensation	4,350	4,350
Repurchase of 2,401,729 shares of common stock	(179,440)						(179,440)
Shares surrendered for tax withholding	(3,217)						(3,217)
Share-based compensation	13,112	13,112
Cash dividends declared - $0.96 per common share	(74,106)		(74,106)
Balance at Sep. 30, 2015	$ 1,428,593	$ 675,191	$ 1,624,759	$ (79,368)	$ (37,898)	$ (23,779)	$ (730,312)