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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Summarized financial information of the reportable segments
Sales	$ 898,178	$ 925,012	$ 1,755,486	$ 1,818,526
Segment operating income	72,162	43,452	128,265	67,655
Operating Segments
Summarized financial information of the reportable segments
Sales	898,178	925,012	1,755,486	1,818,526
Intersegment sales	673	1,338	1,829	2,862
Segment operating income	105,074	86,582	183,569	143,488
Intersegment sales
Summarized financial information of the reportable segments
Intersegment sales	(673)	(1,338)	(1,829)	(2,862)
Segment operating income	(32,912)	(43,130)	(55,304)	(75,833)
FPD
Summarized financial information of the reportable segments
Sales	617,434	673,554	1,219,600	1,308,680
Intersegment sales	257	510	733	1,037
FPD | Operating Segments
Summarized financial information of the reportable segments
Sales	617,434	673,554	1,219,600	1,308,680
Segment operating income	67,845	60,355	121,627	100,080
FCD
Summarized financial information of the reportable segments
Sales	280,744	251,458	535,886	509,846
Intersegment sales	416	828	1,096	1,825
FCD | Operating Segments
Summarized financial information of the reportable segments
Sales	280,744	251,458	535,886	509,846
Segment operating income	$ 37,229	$ 26,227	$ 61,942	$ 43,408

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