Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Summarized financial information of the reportable segments
Sales	$ 1,026,232	$ 1,162,247	$ 1,973,480	$ 2,176,867
Segment operating income	98,004	127,577	172,414	220,953
Intersegment sales
Summarized financial information of the reportable segments
Sales	0	0	0	0
Engineered Product Division
Summarized financial information of the reportable segments
Sales	502,720	558,334	966,946	1,031,747
Segment operating income	65,257	86,227	123,638	155,056
Engineered Product Division | Intersegment sales
Summarized financial information of the reportable segments
Sales	9,052	12,431	18,665	23,177
Industrial Product Division
Summarized financial information of the reportable segments
Sales	208,132	248,659	394,836	463,371
Segment operating income	5,485	7,070	9,483	(6,269)
Industrial Product Division | Intersegment sales
Summarized financial information of the reportable segments
Sales	6,899	12,156	17,646	20,812
Flow Control Division
Summarized financial information of the reportable segments
Sales	315,380	355,254	611,698	681,749
Segment operating income	48,450	54,489	87,300	109,204
Flow Control Division | Intersegment sales
Summarized financial information of the reportable segments
Sales	1,805	1,111	4,473	1,778
Subtotal–Reportable Segments
Summarized financial information of the reportable segments
Sales	1,026,232	1,162,247	1,973,480	2,176,867
Segment operating income	119,192	147,786	220,421	257,991
Subtotal–Reportable Segments | Intersegment sales
Summarized financial information of the reportable segments
Sales	17,756	25,698	40,784	45,767
Eliminations and All Other
Summarized financial information of the reportable segments
Sales	0	0	0	0
Segment operating income	(21,188)	(20,209)	(48,007)	(37,038)
Eliminations and All Other | Intersegment sales
Summarized financial information of the reportable segments
Sales	$ (17,756)	$ (25,698)	$ (40,784)	$ (45,767)