Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales	$ 350.0	$ 228.3	$ 709.6	$ 594.6
Cost of sales	310.1	214.1	617.7	526.5
Gross profit	39.9	14.2	91.9	68.1
Selling, general and administrative expenses	43.3	35.1	83.0	76.0
Operating (loss) income	(3.4)	(20.9)	8.9	(7.9)
Other components of pension income and other postretirement benefits expense, net	2.5	1.8	4.9	3.6
Interest expense, net	(7.4)	(7.5)	(14.8)	(15.5)
Loss before income taxes	(8.3)	(26.6)	(1.0)	(19.8)
Income tax benefit	2.8	9.6	0.9	4.1
Net loss	(5.5)	(17.0)	(0.1)	(15.7)
Net loss attributable to noncontrolling interests	0.2	0.4	0.3	0.3
Net (loss) income attributable to Park-Ohio Holdings Corp. common shareholders	$ (5.3)	$ (16.6)	$ 0.2	$ (15.4)
(Loss) income per common share attributable to Park-Ohio Holdings Corp. common shareholders:
Basic (in dollars per share)	$ (0.44)	$ (1.38)	$ 0.02	$ (1.27)
Diluted (in dollars per share)	$ (0.44)	$ (1.38)	$ 0.02	$ (1.27)
Weighted-average shares used to compute (loss) income per share:
Basic (in shares)	12.0	12.1	12.0	12.2
Diluted (in shares)	12.0	12.1	12.3	12.2