Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net sales	$ 352.2	$ 312.7	$ 1,046.9	$ 970.1
Cost of sales	295.0	258.4	873.9	813.7
Gross profit	57.2	54.3	173.0	156.4
Selling, general and administrative expenses	36.5	33.4	109.3	99.9
Litigation settlement gain	0.0	0.0	(3.3)	0.0
Asset impairment charge	0.0	0.0	0.0	4.0
Operating income	20.7	20.9	67.0	52.5
Interest expense	7.8	7.2	23.1	21.3
Loss on extinguishment of debt	0.0	0.0	11.0	0.0
Income before income taxes	12.9	13.7	32.9	31.2
Income tax expense (benefit)	2.7	(0.1)	9.4	5.7
Net income	10.2	13.8	23.5	25.5
Net income attributable to noncontrolling interests	(0.2)	(0.3)	(0.7)	(0.3)
Net income attributable to Park-Ohio Holdings Corp. common shareholders	$ 10.0	$ 13.5	$ 22.8	$ 25.2
Earnings per common share attributable to Park-Ohio Holdings Corp. common shareholders:
Basic (in dollars per share)	$ 0.82	$ 1.12	$ 1.87	$ 2.08
Diluted (in dollars per share)	$ 0.80	$ 1.10	$ 1.83	$ 2.06
Weighted-average shares used to compute earnings per share:
Basic (in shares)	12.2	12.1	12.2	12.1
Diluted (in shares)	12.4	12.3	12.4	12.3
Dividends per common share (in dollars per share)	$ 0.125	$ 0.125	$ 0.375	$ 0.375