Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net sales	$ 1,618.3	$ 1,658.1	$ 1,412.9
Cost of sales	1,358.0	1,386.6	1,180.1
Gross profit	260.3	271.5	232.8
Selling, general and administrative expenses	177.2	176.1	152.3
Gain on sale of assets	0.0	(1.9)	0.0
Litigation settlement gain	0.0	0.0	(3.3)
Operating income	83.1	97.3	83.8
Other components of pension income and other postretirement benefits expense, net	5.6	8.8	6.4
Interest expense, net	(33.8)	(34.3)	(31.5)
Loss on extinguishment of debt	0.0	0.0	(11.0)
Income before income taxes	54.9	71.8	47.7
Income tax expense	(15.2)	(16.6)	(18.2)
Net income	39.7	55.2	29.5
Net income attributable to noncontrolling interest	(1.1)	(1.6)	(0.9)
Net income attributable to ParkOhio common shareholders	$ 38.6	$ 53.6	$ 28.6
Earnings per common share attributable to ParkOhio common shareholders:
Basic (in dollars per share)	$ 3.16	$ 4.37	$ 2.34
Diluted (in dollars per share)	$ 3.12	$ 4.28	$ 2.30
Weighted-average shares used to compute earnings per share:
Basic (in shares)	12,225,481	12,255,490	12,211,978
Diluted (in shares)	12,379,089	12,508,513	12,455,941