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Goodwill & Intangibles Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Line Items]      
Balance beginning of period $ 2,873,023 $ 2,409,699  
Goodwill attributable to acquisitions 85,216 612,866 [1] $ 284,294
Impact of foreign currency translation and other (140,552) (149,542)  
Balance end of period 2,817,687 2,873,023 2,409,699
Gas and Fluid Handling [Member]      
Goodwill [Line Items]      
Balance beginning of period 1,428,358 1,532,201  
Goodwill attributable to acquisitions 85,216 0 [1]  
Impact of foreign currency translation and other (87,308) (103,843)  
Balance end of period 1,426,266 1,428,358 1,532,201
Fabrication Technology [Member]      
Goodwill [Line Items]      
Balance beginning of period 1,444,665 877,498  
Goodwill attributable to acquisitions 0 612,866 [1]  
Impact of foreign currency translation and other (53,244) (45,699)  
Balance end of period $ 1,391,421 $ 1,444,665 $ 877,498
[1] During the year ended December 31, 2015, the Company retrospectively adjusted provisional amounts with respect to an acquisition completed during the three months ended June 27, 2014 to reflect new information obtained about facts and circumstances that existed as of the acquisition date that, if known, would have affected the measurement of the amounts recognized as of that date. See Note 4, “Acquisitions” for further discussion regarding these adjustments.