CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net income	$ 410,573,000	$ 337,257,000	$ 271,109,000
Adjustments to reconcile net income to net cash provided by operating activities:
Loss (gain) on sale of fixed assets - net	946,000	315,000	(28,000)
Loss (gain) on sale of businesses - net	0	(9,273,000)	22,298,000
Asset impairments	0	0	205,000
Depreciation and amortization	39,049,000	38,314,000	37,854,000
Amortization of intangible assets	38,495,000	45,902,000	49,038,000
Amortization of debt issuance expenses	1,332,000	1,320,000	1,295,000
Share-based compensation expense	24,754,000	24,405,000	20,326,000
Deferred income taxes	(4,345,000)	(33,742,000)	(17,308,000)
Non-cash interest expense associated with forward starting swaps	(6,475,000)	(6,655,000)	(6,851,000)
Pension settlement	0	0	3,554,000
Changes in (net of the effect from acquisitions and divestitures):
Receivables	(23,419,000)	(15,803,000)	302,000
Inventories	(23,031,000)	760,000	32,747,000
Other current assets	25,162,000	(20,031,000)	(22,006,000)
Trade accounts payable	(1,220,000)	12,556,000	73,000
Accrued expenses	4,148,000	19,710,000	(5,470,000)
Other - net	(19,574,000)	24,408,000	(923,000)
Net cash flows provided by operating activities	479,345,000	432,753,000	399,917,000
Cash flows from investing activities
Purchases of property, plant and equipment	(56,089,000)	(43,858,000)	(38,242,000)
Purchase of intellectual property	(4,000,000)	0	0
Acquisition of businesses, net of cash acquired	(20,205,000)	(38,161,000)	(510,001,000)
Proceeds from disposal of fixed assets	363,000	6,011,000	49,000
Proceeds from sale of businesses, net of cash sold		21,795,000	39,064,000
Other - net	(1,500,000)	(533,000)	(69,000)
Net cash flows used in investing activities	(81,431,000)	(54,746,000)	(509,199,000)
Cash flows from financing activities
Borrowings under revolving credit facilities	0	33,000,000	501,529,000
Payments under revolving credit facilities	(11,284,000)	(200,618,000)	(520,125,000)
Debt issuance costs	0	0	(246,000)
Dividends paid	(127,478,000)	(111,172,000)	(102,650,000)
Proceeds from stock option exercises	27,639,000	22,935,000	30,240,000
Purchases of common stock	(173,926,000)	(29,074,000)	(57,272,000)
Shares surrendered for tax withholding	(11,555,000)	(6,228,000)	(4,928,000)
Settlement of foreign exchange contracts	6,593,000	13,736,000	0
Net cash flows provided by (used in) financing activities	(290,011,000)	(277,421,000)	46,548,000
Effect of exchange rate changes on cash and cash equivalents	(17,446,000)	39,400,000	(29,320,000)
Net increase (decrease) in cash	90,457,000	139,986,000	(92,054,000)
Cash and cash equivalents at beginning of year	375,950,000	235,964,000	328,018,000
Cash and cash equivalents at end of year	466,407,000	375,950,000	235,964,000
Cash paid for:
Interest	36,327,000	36,818,000	37,067,000
Income taxes - net	90,733,000	104,852,000	109,399,000
Significant non-cash activities:
Contingent consideration for acquisition	3,375,000	0	0
Capital expenditures for construction of new leased facility	$ 11,616,000	0	0
3.20% Senior Notes, due June 2023
Cash flows from financing activities
Proceeds from issuance of Senior Notes		0	100,000,000
3.37% Senior Notes, due June 2025
Cash flows from financing activities
Proceeds from issuance of Senior Notes		$ 0	$ 100,000,000