Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by operating activities			$ 328,669	$ 362,097
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	$ (53,232)	$ (47,147)	(115,421)	(91,545)
Investment and intercompany note activity with subsidiaries			0	0
Acquisitions, net of cash acquired			(1,135,970)	(100,728)	$ (513,088)
Proceeds from Divestiture of Businesses, Net of Cash Divested				301,297
Payments of deferred purchase price on receivables securitization			0	0
Other investing activities, net			2,174	4,712
Net cash (used in) provided by investing activities			(1,249,217)	113,736
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options			2,922	5,151
Taxes paid related to net share settlements of stock-based compensation awards			(3,834)	(3,955)
Debt issuance costs			(16,759)
Proceeds from issuance of Euro Notes (2026/28)			1,232,100
Borrowings under revolving credit facilities			613,658	162,794
Repayments under revolving credit facilities			(766,597)	(585,454)
Repayments under term loans			(8,810)	(18,590)
Borrowings under receivables securitization facility				150
(Repayments) borrowings of other debt, net			(2,444)	(19,591)
Payments of other obligations				(2,079)
Other financing activities, net			4,107	4,316
Investment and intercompany note activity with parent			0	0
Dividends			0	0
Net cash provided by (used in) financing activities			1,054,343	(423,076)
Effect of exchange rate changes on cash and cash equivalents			(68,359)	16,271
Net increase (decrease) in cash and equivalents			65,436	69,028
Cash and cash equivalents of continuing operations, beginning of period					279,766	$ 227,400
Add: Cash and cash equivalents of discontinued operations, beginning of period				7,116	7,116
Cash and cash equivalents of continuing and discontinued operations, beginning of period	345,202	303,544	345,202	303,544	279,766	234,516
Cash and cash equivalents, end of period	345,202	303,544	345,202	303,544	279,766
Repayments under receivables securitization facility				(5,000)
Parent
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by operating activities			149,253	156,127
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment			(260)	64
Investment and intercompany note activity with subsidiaries			48,339	(276,377)
Acquisitions, net of cash acquired			0	0
Proceeds from Divestiture of Businesses, Net of Cash Divested				0
Payments of deferred purchase price on receivables securitization			0	0
Other investing activities, net			(887)	0
Net cash (used in) provided by investing activities			48,966	276,313
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options			2,922	5,151
Taxes paid related to net share settlements of stock-based compensation awards			(3,834)	3,955
Debt issuance costs			(682)
Borrowings under revolving credit facilities			264,000	97,000
Repayments under revolving credit facilities			(451,931)	515,931
Repayments under term loans			(8,810)	18,590
Borrowings under receivables securitization facility				0
(Repayments) borrowings of other debt, net			(385)	1,700
Payments of other obligations				0
Other financing activities, net				0
Investment and intercompany note activity with parent			0	0
Dividends			0	0
Net cash provided by (used in) financing activities			(198,720)	(438,025)
Effect of exchange rate changes on cash and cash equivalents			0	0
Net increase (decrease) in cash and equivalents			(501)	(5,585)
Cash and cash equivalents of continuing operations, beginning of period					34,360	33,030
Cash and cash equivalents of continuing and discontinued operations, beginning of period						33,030
Cash and cash equivalents, end of period	33,859	27,445	33,859	27,445	34,360
Repayments under receivables securitization facility				0
Guarantors
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by operating activities			244,304	284,227
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment			(62,744)	41,718
Investment and intercompany note activity with subsidiaries			0	0
Acquisitions, net of cash acquired			(2,527)	78,121
Proceeds from Divestiture of Businesses, Net of Cash Divested				305,740
Payments of deferred purchase price on receivables securitization			14,926	6,362
Other investing activities, net			(423)	(395)
Net cash (used in) provided by investing activities			(49,922)	191,868
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options			0	0
Taxes paid related to net share settlements of stock-based compensation awards			0	0
Debt issuance costs			0
Borrowings under revolving credit facilities			0	0
Repayments under revolving credit facilities			0	0
Repayments under term loans			0	0
Borrowings under receivables securitization facility				0
(Repayments) borrowings of other debt, net			289	1,161
Payments of other obligations				(1,336)
Other financing activities, net				5,000
Investment and intercompany note activity with parent			(42,596)	(269,668)
Dividends			(148,099)	199,095
Net cash provided by (used in) financing activities			(190,406)	(466,260)
Effect of exchange rate changes on cash and cash equivalents			(805)	521
Net increase (decrease) in cash and equivalents			3,171	10,356
Cash and cash equivalents of continuing operations, beginning of period					35,131	35,360
Cash and cash equivalents of continuing and discontinued operations, beginning of period						35,509
Cash and cash equivalents, end of period	38,302	45,865	38,302	45,865	35,131
Repayments under receivables securitization facility				0
Non-Guarantors
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by operating activities			68,285	114,476
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment			(52,417)	49,763
Investment and intercompany note activity with subsidiaries			0	0
Acquisitions, net of cash acquired			(1,133,443)	22,607
Proceeds from Divestiture of Businesses, Net of Cash Divested				(4,443)
Payments of deferred purchase price on receivables securitization			0	0
Other investing activities, net			(864)	5,107
Net cash (used in) provided by investing activities			(1,184,996)	(71,706)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options			0	0
Taxes paid related to net share settlements of stock-based compensation awards			0	0
Debt issuance costs			(16,077)
Proceeds from issuance of Euro Notes (2026/28)			1,232,100
Borrowings under revolving credit facilities			349,658	65,794
Repayments under revolving credit facilities			(314,666)	69,523
Repayments under term loans			0	0
Borrowings under receivables securitization facility				150
(Repayments) borrowings of other debt, net			(2,348)	(22,452)
Payments of other obligations				(743)
Other financing activities, net			4,107	(684)
Investment and intercompany note activity with parent			(5,743)	(6,709)
Dividends			0	0
Net cash provided by (used in) financing activities			1,247,031	5,737
Effect of exchange rate changes on cash and cash equivalents			(67,554)	15,750
Net increase (decrease) in cash and equivalents			62,766	64,257
Cash and cash equivalents of continuing operations, beginning of period					210,275	159,010
Cash and cash equivalents of continuing and discontinued operations, beginning of period						165,977
Cash and cash equivalents, end of period	273,041	230,234	273,041	230,234	210,275
Repayments under receivables securitization facility				(5,000)
Continuing and Discontinued Operations
CASH FLOWS FROM FINANCING ACTIVITIES:
Add: Cash and cash equivalents of discontinued operations, beginning of period				7,116	7,116
Continuing and Discontinued Operations | Parent
CASH FLOWS FROM FINANCING ACTIVITIES:
Add: Cash and cash equivalents of discontinued operations, beginning of period				0	0
Continuing and Discontinued Operations | Guarantors
CASH FLOWS FROM FINANCING ACTIVITIES:
Add: Cash and cash equivalents of discontinued operations, beginning of period				149	149
Continuing and Discontinued Operations | Non-Guarantors
CASH FLOWS FROM FINANCING ACTIVITIES:
Add: Cash and cash equivalents of discontinued operations, beginning of period				6,967	6,967
Eliminations
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by operating activities			(133,173)	(192,733)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment			0	0
Investment and intercompany note activity with subsidiaries			(48,339)	276,377
Acquisitions, net of cash acquired			0	0
Proceeds from Divestiture of Businesses, Net of Cash Divested				0
Payments of deferred purchase price on receivables securitization			(14,926)	(6,362)
Other investing activities, net			0	0
Net cash (used in) provided by investing activities			(63,265)	(282,739)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options			0	0
Taxes paid related to net share settlements of stock-based compensation awards			0	0
Debt issuance costs			0
Borrowings under revolving credit facilities			0	0
Repayments under revolving credit facilities			0	0
Repayments under term loans			0	0
Borrowings under receivables securitization facility				0
(Repayments) borrowings of other debt, net			0	0
Payments of other obligations				0
Other financing activities, net				0
Investment and intercompany note activity with parent			48,339	276,377
Dividends			148,099	(199,095)
Net cash provided by (used in) financing activities			196,438	475,472
Effect of exchange rate changes on cash and cash equivalents			0	0
Net increase (decrease) in cash and equivalents			0	0
Cash and cash equivalents of continuing operations, beginning of period					0	0
Add: Cash and cash equivalents of discontinued operations, beginning of period				0	0
Cash and cash equivalents of continuing and discontinued operations, beginning of period						$ 0
Cash and cash equivalents, end of period	$ 0	$ 0	$ 0	0	$ 0
Repayments under receivables securitization facility				$ 0