Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales	$ 415.3	$ 432.2	$ 835.4	$ 837.9
Cost of sales	349.1	359.1	703.9	699.7
Gross profit	66.2	73.1	131.5	138.2
Selling, general and administrative expenses	46.9	47.8	89.7	90.8
Gain on sale of assets	0.0	(1.9)	0.0	(1.9)
Operating income	19.3	27.2	41.8	49.3
Other components of pension income and other postretirement benefits expense, net	1.5	2.1	2.8	4.4
Interest expense, net	(8.7)	(8.8)	(16.9)	(17.2)
Income before income taxes	12.1	20.5	27.7	36.5
Income tax expense	(4.2)	(5.5)	(8.1)	(11.3)
Net income	7.9	15.0	19.6	25.2
Net income attributable to noncontrolling interests	(0.3)	(0.2)	(0.8)	(0.6)
Net income attributable to Park-Ohio Holdings Corp. common shareholders	$ 7.6	$ 14.8	$ 18.8	$ 24.6
Earnings per common share attributable to Park-Ohio Holdings Corp. common shareholders:
Basic (in dollars per share)	$ 0.62	$ 1.20	$ 1.54	$ 2.00
Diluted (in dollars per share)	$ 0.61	$ 1.18	$ 1.51	$ 1.96
Weighted-average shares used to compute earnings per share:
Basic (in shares)	12.2	12.3	12.2	12.3
Diluted (in shares)	12.4	12.6	12.4	12.6