Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 31, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Net sales	$ 1,206,356	$ 1,164,453	$ 1,199,336	$ 1,054,331	$ 1,171,378	$ 1,014,570	$ 1,074,118	$ 947,143	$ 4,624,476	[1]	$ 4,207,209	[1]	$ 3,913,856	[1]
Income before income taxes									358,248	[2]	302,795	[2]	48,439	[2]
Interest expense									51,305	[2]	103,597	[2]	91,570	[2]
Restructuring and other related charges									58,121	[2]	35,502	[2]	60,060	[2]
Segment Operating Income (Loss)									467,674	[2]	441,894	[2]	200,069	[2]
Depreciation, amortization and impairment charges									174,724		119,258		183,403
Capital expenditures									84,479		71,482		83,586
Equity Method Investments	52,496				50,795				52,496		50,795
Assets	7,245,098				6,601,184				7,245,098		6,601,184
Gas and Fluid Handling [Member]
Net sales									2,329,598		2,104,048		1,901,132
Segment Operating Income (Loss)									254,240		270,708		141,524
Depreciation, amortization and impairment charges									96,763		62,792		112,389
Capital expenditures									32,558		37,995		42,343
Equity Method Investments	7,085				7,097				7,085		7,097
Assets	3,660,361				4,028,675				3,660,361		4,028,675
Fabrication Technology [Member]
Net sales									2,294,878		2,103,161		2,012,724
Segment Operating Income (Loss)									265,813		219,634		140,184
Depreciation, amortization and impairment charges									76,406		55,339		69,708
Capital expenditures									47,955		33,437		41,146
Equity Method Investments	45,411				43,698				45,411		43,698
Assets	3,489,388				2,477,534				3,489,388		2,477,534
Corporate and Other [Member]
Segment Operating Income (Loss)									(52,379)		(48,448)		(81,639)
Depreciation, amortization and impairment charges									1,555		1,127		1,306
Capital expenditures									3,966		50		97
Assets	$ 95,349				$ 94,975				$ 95,349		$ 94,975

[1] The Company attributes revenues from external customers to individual countries based upon the country in which the sale was originated.

[2] The following is a reconciliation of Income before income taxes to segment operating income: