Operating Segments and Related Information (Details 3) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated segment operating income		$ 512,845	$ 472,759	$ 462,481
Unallocated corporate expense		(117,657)	(118,358)	(97,440)
Amortization of Intangible Assets		47,600	57,500	24,700
Asset Impairment Charges	$ (13,700)	0	(13,666)	(3,349)
Restructuring expenses		(30,475)	(10,099)	(4,854)
Loss on sale of Business		0	0	(13,708)
Operating Income (Loss)		317,242	273,260	318,606
Gain (Loss) on Extinguishment of Debt		(9,126)	0	0
Other Nonoperating Expense		(23,112)	(31,344)	(11,503)
Consolidated earnings before income taxes		285,004	241,916	307,103
Goodwill	1,364,596	1,394,364	1,364,596	904,571
Cash and Cash Equivalents	284,592	297,795	284,592
Prepaid expense and other current assets, excluding demo assets	86,337	74,526	86,337
Property, Plant and Equipment, Net	255,905	267,682	255,905
Deferred income taxes, net	39,983	36,210	39,983
Intangible assets, net	247,514	209,636	247,514
Other assets	120,809	116,217	120,809
Assets	3,137,541	3,252,348	3,137,541
Acquired Intangible Assets [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Amortization of Intangible Assets		(47,471)	(57,376)	(24,524)
Intangible assets, net	246,461	209,463	246,461
Total Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Operating Income (Loss)		512,845	472,759	462,481
BU assets (accounts receivable, inventories and demonstration assets, net)	737,805	855,918	737,805
Goodwill	1,364,596	1,394,364	1,364,596
BU assets (AR, inventories, demo assets and goodwill, net)	2,102,401	2,250,282	2,102,401
Industrial
Segment Reporting, Asset Reconciling Item [Line Items]
Operating Income (Loss)		344,376	276,167	268,472
BU assets (accounts receivable, inventories and demonstration assets, net)	405,166	419,323	405,166
Goodwill	635,899	651,439	635,899	620,383
Government and defense
Segment Reporting, Asset Reconciling Item [Line Items]
Operating Income (Loss)		168,469	196,592	194,009
BU assets (accounts receivable, inventories and demonstration assets, net)	332,639	436,595	332,639
Goodwill	$ 728,697	$ 742,925	$ 728,697	$ 284,188