Condensed Consolidated Statements of Income (Loss) (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net sales	$ 340.2	$ 403.4	$ 934.8	$ 1,238.8
Cost of sales	290.5	336.9	817.0	1,040.8
Gross profit	49.7	66.5	117.8	198.0
Selling, general and administrative expenses	38.7	42.7	114.7	132.4
Operating income	11.0	23.8	3.1	65.6
Other components of pension income and other postretirement benefits expense, net	1.9	1.4	5.5	4.2
Interest expense, net	(7.4)	(8.6)	(22.9)	(25.5)
Income (loss) before income taxes	5.5	16.6	(14.3)	44.3
Income tax (expense) benefit	(0.3)	(4.2)	3.8	(12.3)
Net income (loss)	5.2	12.4	(10.5)	32.0
Net loss (income) attributable to noncontrolling interests	0.1	(0.2)	0.4	(1.0)
Net income (loss) attributable to Park-Ohio Holdings Corp. common shareholders	$ 5.3	$ 12.2	$ (10.1)	$ 31.0
Income (loss) per common share attributable to Park-Ohio Holdings Corp. common shareholders:
Basic (in dollars per share)	$ 0.44	$ 1.00	$ (0.83)	$ 2.54
Diluted (in dollars per share)	$ 0.44	$ 0.99	$ (0.83)	$ 2.51
Weighted-average shares used to compute income (loss) per share:
Basic (in shares)	12.0	12.2	12.1	12.2
Diluted (in shares)	12.0	12.3	12.1	12.4