Condensed Consolidated Statements of Income (Loss) (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 228.3	$ 415.3	$ 594.6	$ 835.4
Cost of sales	214.1	349.1	526.5	703.9
Gross profit	14.2	66.2	68.1	131.5
Selling, general and administrative expenses	35.1	46.9	76.0	89.7
Operating (loss) income	(20.9)	19.3	(7.9)	41.8
Other components of pension income and other postretirement benefits expense, net	1.8	1.5	3.6	2.8
Interest expense, net	(7.5)	(8.7)	(15.5)	(16.9)
(Loss) income before income taxes	(26.6)	12.1	(19.8)	27.7
Income tax benefit (expense)	9.6	(4.2)	4.1	(8.1)
Net (loss) income	(17.0)	7.9	(15.7)	19.6
Net loss (income) attributable to noncontrolling interests	0.4	(0.3)	0.3	(0.8)
Net (loss) income attributable to Park-Ohio Holdings Corp. common shareholders	$ (16.6)	$ 7.6	$ (15.4)	$ 18.8
(Loss) income per common share attributable to Park-Ohio Holdings Corp. common shareholders:
Basic (in dollars per share)	$ (1.38)	$ 0.62	$ (1.27)	$ 1.54
Diluted (in dollars per share)	$ (1.38)	$ 0.61	$ (1.27)	$ 1.51
Weighted-average shares used to compute (loss) income per share:
Basic (in shares)	12.1	12.2	12.2	12.2
Diluted (in shares)	12.1	12.4	12.2	12.4