Business Segment Information (Reportable Segments) (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) segments	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments (in segments) | segments									2
Summarized financial information of the reportable segments
Sales to external customers	$ 919,500	$ 866,100	$ 898,200	$ 857,300	$ 985,300	$ 924,300	$ 925,000	$ 893,500	$ 3,541,060	$ 3,728,134	$ 3,939,697
Intersegment sales									0	0	0
Segment operating income (loss)									270,759	250,277	386,623
Depreciation and amortization									99,822	100,753	105,904
Identifiable assets	4,749,768				5,314,677				4,749,768	5,314,677	4,938,277
Capital expenditures									54,936	57,405	75,716
Subtotal—Reportable Segments
Summarized financial information of the reportable segments
Sales to external customers									3,541,060	3,728,134	3,939,697
Intersegment sales									5,674	5,085	5,464
Segment operating income (loss)									362,854	396,533	535,459
Depreciation and amortization									72,380	74,339	74,422
Identifiable assets	4,150,662				4,347,205				4,150,662	4,347,205	4,308,087
Capital expenditures									33,858	35,757	40,899
Eliminations and All Other
Summarized financial information of the reportable segments
Sales to external customers									0	0	0
Intersegment sales									(5,674)	(5,085)	(5,464)
Segment operating income (loss)									(92,095)	(146,256)	(148,836)
Depreciation and amortization									27,442	26,414	31,482
Identifiable assets	599,106				967,472				599,106	967,472	630,190
Capital expenditures									21,078	21,648	34,817
FPD
Summarized financial information of the reportable segments
Sales to external customers									2,468,098	2,673,705	2,704,445
Intersegment sales									2,750	1,965	1,833
Segment operating income (loss)									243,203	270,960	343,514
Depreciation and amortization									51,094	52,390	50,845
Identifiable assets	2,927,346				3,039,069				2,927,346	3,039,069	2,974,161
Capital expenditures									21,575	21,714	26,450
FCD
Summarized financial information of the reportable segments
Sales to external customers									1,072,962	1,054,429	1,235,252
Intersegment sales									2,924	3,120	3,631
Segment operating income (loss)									119,651	125,573	191,945
Depreciation and amortization									21,286	21,949	23,577
Identifiable assets	$ 1,223,316				$ 1,308,136				1,223,316	1,308,136	1,333,926
Capital expenditures									$ 12,283	$ 14,043	$ 14,449