Revenue Recognition (Disaggregation of revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Sales	$ 996,544	$ 952,716	$ 2,876,679	$ 2,845,798
Original Equipment
Disaggregation of Revenue [Line Items]
Sales	508,946	495,733	1,421,398	1,445,627
Aftermarket
Disaggregation of Revenue [Line Items]
Sales	487,598	456,983	1,455,281	1,400,171
FPD
Disaggregation of Revenue [Line Items]
Sales	682,798	647,298	1,965,523	1,958,806
FPD | Original Equipment
Disaggregation of Revenue [Line Items]
Sales	256,664	255,869	706,092	756,296
FPD | Aftermarket
Disaggregation of Revenue [Line Items]
Sales	426,134	391,429	1,259,431	1,202,510
FCD
Disaggregation of Revenue [Line Items]
Sales	313,746	305,418	911,156	886,992
FCD | Original Equipment
Disaggregation of Revenue [Line Items]
Sales	252,282	239,864	715,306	689,331
FCD | Aftermarket
Disaggregation of Revenue [Line Items]
Sales	61,464	65,554	195,850	197,661
North America
Disaggregation of Revenue [Line Items]
Sales	413,464	392,401	1,200,839	1,173,474
North America | FPD
Disaggregation of Revenue [Line Items]
Sales	279,583	251,503	797,092	774,602
North America | FCD
Disaggregation of Revenue [Line Items]
Sales	133,881	140,898	403,747	398,872
Latin America
Disaggregation of Revenue [Line Items]
Sales	59,020	80,628	158,290	176,798
Latin America | FPD
Disaggregation of Revenue [Line Items]
Sales	51,338	76,167	134,716	161,344
Latin America | FCD
Disaggregation of Revenue [Line Items]
Sales	7,682	4,461	23,574	15,454
Middle East And Africa
Disaggregation of Revenue [Line Items]
Sales	111,703	104,574	319,178	340,451
Middle East And Africa | FPD
Disaggregation of Revenue [Line Items]
Sales	87,982	70,666	249,694	240,497
Middle East And Africa | FCD
Disaggregation of Revenue [Line Items]
Sales	23,721	33,908	69,484	99,954
Asia Pacific
Disaggregation of Revenue [Line Items]
Sales	215,834	185,116	594,404	584,392
Asia Pacific | FPD
Disaggregation of Revenue [Line Items]
Sales	129,047	119,258	367,204	385,955
Asia Pacific | FCD
Disaggregation of Revenue [Line Items]
Sales	86,787	65,858	227,200	198,437
Europe
Disaggregation of Revenue [Line Items]
Sales	196,523	189,997	603,968	570,683
Europe | FPD
Disaggregation of Revenue [Line Items]
Sales	134,848	129,704	416,817	396,408
Europe | FCD
Disaggregation of Revenue [Line Items]
Sales	$ 61,675	$ 60,293	$ 187,151	$ 174,275