Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2019		Sep. 30, 2019		Jun. 30, 2019		Mar. 31, 2019		Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Data [Abstract]
Sales	$ 1,068,200		$ 996,500		$ 990,100		$ 890,100		$ 986,900		$ 952,700		$ 973,100		$ 920,000		$ 3,944,850	$ 3,832,666	$ 3,660,831
Gross profit	349,600		333,700		318,000		294,100		321,800		308,500		286,100		271,400		1,295,370	1,187,836	1,088,953
Earnings before income taxes	86,700		96,200		82,900		76,100		78,600		44,400		28,300		25,000		341,850	176,274	263,007
Net earnings attributable to Flowserve Corporation	$ 69,800		$ 68,400		$ 58,200		$ 57,300		$ 63,100		$ 28,200		$ 13,200		$ 15,100		$ 253,668	$ 119,671	$ 2,652
Earnings per share:
Basic (in dollars per share)	$ 0.53	[1]	$ 0.52	[1]	$ 0.44	[1]	$ 0.44	[1]	$ 0.48	[1]	$ 0.22	[1]	$ 0.10	[1]	$ 0.12	[1]	$ 1.94	$ 0.91	$ 0.02
Diluted (in dollars per share)	$ 0.53	[1]	$ 0.52	[1]	$ 0.44	[1]	$ 0.44	[1]	$ 0.48	[1]	$ 0.21	[1]	$ 0.10	[1]	$ 0.12	[1]	$ 1.93	$ 0.91	$ 0.02

[1] Earnings per share is computed independently for each of the quarters presented. The sum of the quarters may not equal the total year amount due to the impact of changes in weighted average quarterly shares outstanding.