Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Net sales	$ 1,438.0	$ 1,295.2	$ 1,618.3
Cost of sales	1,281.9	1,126.6	1,358.0
Gross profit	156.1	168.6	260.3
Selling, general and administrative expenses	178.3	152.9	177.2
Gain on sale of assets	(14.7)	0.0	0.0
Goodwill impairment	4.6	0.0	0.0
Operating (loss) income	(12.1)	15.7	83.1
Other components of pension income and other postretirement benefits expense, net	9.7	7.3	5.6
Interest expense, net	(30.1)	(30.3)	(33.8)
(Loss) income before income taxes	(32.5)	(7.3)	54.9
Income tax benefit (expense)	6.5	2.5	(15.2)
Net (loss) income	(26.0)	(4.8)	39.7
Net loss (income) attributable to noncontrolling interest	1.2	0.3	(1.1)
Net (loss) income attributable to ParkOhio common shareholders	$ (24.8)	$ (4.5)	$ 38.6
(Loss) earnings per common share attributable to ParkOhio common shareholders:
Basic (in dollars per share)	$ (2.07)	$ (0.37)	$ 3.16
Diluted (in dollars per share)	$ (2.07)	$ (0.37)	$ 3.12
Weighted-average shares used to compute (loss) earnings per share:
Basic (in shares)	12,007,000	12,061,419	12,225,481
Diluted (in shares)	12,007,000	12,061,419	12,379,089