Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Net sales		$ 1,651,248	$ 1,728,524	$ 4,955,498	$ 4,875,799
Direct contribution		277,684	320,937	886,290	828,460
Corporate and unallocated costs		(131,311)	(135,782)	(437,032)	(387,309)
Amortization of intangible assets		(88,306)	(90,162)	(293,499)	(274,819)
Impairment of goodwill				(3,400)
Integration, acquisition, restructuring and other		(5,046)	(10,836)	(41,546)	(30,622)
Operating income		53,021	84,157	110,813	135,710
Interest expense		23,969	20,211	70,142	63,238
(Gain) loss on investments		(1,400)	839	(1,718)	8,978
Interest income		(1,764)	(2,288)	(5,088)	(5,997)
Loss (gain) on foreign currency		2,025	(8,543)	6,034	5,570
Other expense (income), net		35	1,434	(25)	2,275
Income before income taxes		30,156	72,504	41,468	61,646
CPE
Segment Reporting Information [Line Items]
Impairment of goodwill				0
N&C
Segment Reporting Information [Line Items]
Impairment of goodwill				(3,400)
Enterprise
Segment Reporting Information [Line Items]
Impairment of goodwill				0
Operating Segments | CPE
Segment Reporting Information [Line Items]
Net sales		941,469	1,174,750	2,824,827	3,385,689
Direct contribution		62,152	121,982	197,636	344,746
Operating Segments | N&C
Segment Reporting Information [Line Items]
Net sales		532,035	556,863	1,619,795	1,498,271
Direct contribution		199,137	198,955	628,957	483,714
Operating Segments | Enterprise
Segment Reporting Information [Line Items]
Net sales		180,159	0	522,313	0
Direct contribution		16,395	0	59,697	0
Other
Segment Reporting Information [Line Items]
Net sales	[1]	(2,415)	(3,089)	(11,437)	(8,161)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Corporate and unallocated costs		(131,311)	(135,782)	(437,032)	(387,309)
Amortization of intangible assets		$ (88,306)	$ (90,162)	$ (293,499)	$ (274,819)

[1] Adjustments related acquisition accounting impacts related to deferred revenue