Acquisitions and Divestitures - Acquisitions (Details) $ in Thousands, € in Millions						3 Months Ended		9 Months Ended
	Aug. 31, 2016 EUR (€)	Aug. 31, 2016 USD ($)	Jul. 01, 2016 EUR (€)	Jul. 01, 2016 USD ($)	Mar. 16, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Goodwill						$ 1,679,768		$ 1,679,768		$ 1,632,592
Akron Brass
Business Acquisition [Line Items]
Aggregate purchase price, cash paid					$ 221,400
Goodwill					124,600
Intangible assets					$ 90,400
AWG Fittings GmbH (AWG)
Business Acquisition [Line Items]
Aggregate purchase price, cash paid			€ 42.8	$ 47,500
Goodwill				22,000
Intangible assets				$ 10,300
SFC-Koenig AG (SFC)
Business Acquisition [Line Items]
Aggregate purchase price, cash paid	€ 215.9	$ 241,100
Goodwill		141,300
Intangible assets		$ 117,000
Selling, general and administrative expenses
Business Acquisition [Line Items]
Acquisition-related transaction costs						$ 500	$ 1,600	$ 700	$ 4,000
Cost of goods sold
Business Acquisition [Line Items]
Fair value of inventory charges associated with acquisitions							$ 4,600		$ 10,400