Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Net sales	$ 350.9	$ 329.4	$ 694.7	$ 657.4
Cost of sales	290.6	275.1	578.9	555.3
Gross profit	60.3	54.3	115.8	102.1
Selling, general and administrative expenses	36.2	34.0	72.8	66.5
Litigation settlement gain	0.0	0.0	(3.3)	0.0
Asset impairment charge	0.0	0.0	0.0	4.0
Operating income	24.1	20.3	46.3	31.6
Interest expense	7.9	7.0	15.3	14.1
Loss on extinguishment of debt	11.0	0.0	11.0	0.0
Income before income taxes	5.2	13.3	20.0	17.5
Income tax expense	2.0	4.3	6.7	5.8
Net income	3.2	9.0	13.3	11.7
Net income attributable to noncontrolling interests	(0.2)	0.0	(0.5)	0.0
Net income attributable to Park-Ohio Holdings Corp. common shareholders	$ 3.0	$ 9.0	$ 12.8	$ 11.7
Earnings per common share attributable to Park-Ohio Holdings Corp. common shareholders:
Basic (in dollars per share)	$ 0.25	$ 0.74	$ 1.05	$ 0.97
Diluted (in dollars per share)	$ 0.24	$ 0.73	$ 1.03	$ 0.96
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	12.5	12.2
Dividends per common share (in dollars per share)	$ 0.125	$ 0.125	$ 0.25	$ 0.25