EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net income attributable to Franklin Electric Co., Inc.	$ 30,497	$ 29,909	$ 51,671	$ 45,639
Less: Undistributed earnings allocated to participating securities	200	200	400	300
Less: Undistributed earnings allocated to redeemable noncontrolling interest	0	(200)	0	0
Net income available to common shareholders	$ 30,300	$ 29,900	$ 51,300	$ 45,300
Basic
Basic weighted average common shares outstanding (in shares)	46.5	46.5	46.5	46.4
Effect of dilutive securities:
Non-participating employee stock options and performance awards (in shares)	0.5	0.5	0.5	0.6
Diluted weighted average common shares outstanding (in shares)	47.0	47.0	47.0	47.0
Basic earnings per share (in dollars per share)	$ 0.65	$ 0.64	$ 1.10	$ 0.97
Diluted earnings per share (in dollars per share)	$ 0.64	$ 0.64	$ 1.09	$ 0.97
Anti-dilutive stock options (in shares)	0.2	0.4	0.2	0.3