CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities
Net income	$ 425,521,000	$ 410,573,000	$ 337,257,000
Adjustments to reconcile net income to net cash provided by operating activities:
Loss (gain) on sale of fixed assets - net	156,000	946,000	315,000
Loss (gain) on sale of businesses - net	0	0	(9,273,000)
Asset impairments	10,155,000	0	0
Depreciation and amortization	39,543,000	39,049,000	38,314,000
Amortization of intangible assets	37,333,000	38,495,000	45,902,000
Amortization of debt issuance expenses	1,355,000	1,332,000	1,320,000
Share-based compensation expense	27,669,000	24,754,000	24,405,000
Deferred income taxes	6,625,000	(4,345,000)	(33,742,000)
Non-cash interest expense associated with forward starting swaps	6,327,000	6,475,000	6,655,000
Changes in (net of the effect from acquisitions and divestitures):
Receivables	22,338,000	(23,419,000)	(15,803,000)
Inventories	(3,322,000)	(23,031,000)	760,000
Other current assets	(2,361,000)	25,162,000	(20,031,000)
Trade accounts payable	(9,115,000)	(1,220,000)	12,556,000
Accrued expenses	(37,086,000)	4,148,000	19,710,000
Other - net	2,924,000	(19,574,000)	24,408,000
Net cash flows provided by operating activities	528,062,000	479,345,000	432,753,000
Cash flows from investing activities
Purchases of property, plant and equipment	(50,912,000)	(56,089,000)	(43,858,000)
Purchase of intellectual property	0	(4,000,000)	0
Acquisition of businesses, net of cash acquired	(87,180,000)	(20,205,000)	(38,161,000)
Proceeds from disposal of fixed assets	962,000	363,000	6,011,000
Proceeds from sale of businesses, net of cash sold	0	0	21,795,000
Other - net	115,000	(1,500,000)	(533,000)
Net cash flows used in investing activities	(137,015,000)	(81,431,000)	(54,746,000)
Cash flows from financing activities
Borrowings under revolving credit facilities	0	0	33,000,000
Payments under revolving credit facilities	0	(11,284,000)	(200,618,000)
Payments under other long-term borrowings	(50,057,000)	0	0
Dividends paid	(147,208,000)	(127,478,000)	(111,172,000)
Proceeds from stock option exercises	38,809,000	27,639,000	22,935,000
Repurchases of common stock	(54,668,000)	(173,926,000)	(29,074,000)
Shares surrendered for tax withholding	(12,596,000)	(11,555,000)	(6,228,000)
Settlement of foreign exchange contracts	0	6,593,000	13,736,000
Other - net	(1,865,000)	0	0
Net cash flows used in financing activities	(227,585,000)	(290,011,000)	(277,421,000)
Effect of exchange rate changes on cash and cash equivalents	2,712,000	(17,446,000)	39,400,000
Net increase in cash	166,174,000	90,457,000	139,986,000
Cash and cash equivalents at beginning of year	466,407,000	375,950,000	235,964,000
Cash and cash equivalents at end of year	632,581,000	466,407,000	375,950,000
Cash paid for:
Interest	36,683,000	36,327,000	36,818,000
Income taxes - net	109,032,000	90,733,000	104,852,000
Significant non-cash activities:
Contingent consideration for acquisition	0	3,375,000	0
Debt acquired with acquisition of business	51,130,000	0	0
Capital expenditures for construction of new leased facility	$ 0	$ 11,616,000	$ 0