Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales	$ 366.3	$ 420.1
Cost of sales	312.4	354.8
Gross profit	53.9	65.3
Selling, general and administrative expenses	40.9	42.8
Operating income	13.0	22.5
Other components of pension income and other postretirement benefits expense, net	1.8	1.3
Interest expense, net	(8.0)	(8.2)
Income before income taxes	6.8	15.6
Income tax expense	(5.5)	(3.9)
Net income	1.3	11.7
Net income attributable to noncontrolling interests	(0.1)	(0.5)
Net income attributable to Park-Ohio Holdings Corp. common shareholders	$ 1.2	$ 11.2
Earnings per common share attributable to Park-Ohio Holdings Corp. common shareholders:
Basic (in dollars per share)	$ 0.10	$ 0.92
Diluted (in dollars per share)	$ 0.10	$ 0.90
Weighted-average shares used to compute earnings per share:
Basic (in shares)	12.2	12.2
Diluted (in shares)	12.3	12.4