Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Net sales	$ 420.1	$ 405.7
Cost of sales	354.8	340.6
Gross profit	65.3	65.1
Selling, general and administrative expenses	42.8	43.0
Operating income	22.5	22.1
Other components of pension income and other postretirement benefits expense, net	1.3	2.3
Interest expense, net	(8.2)	(8.4)
Income before income taxes	15.6	16.0
Income tax expense	(3.9)	(5.8)
Net income	11.7	10.2
Net income attributable to noncontrolling interests	(0.5)	(0.4)
Net income attributable to Park-Ohio Holdings Corp. common shareholders	$ 11.2	$ 9.8
Earnings per common share attributable to Park-Ohio Holdings Corp. common shareholders:
Basic (in dollars per share)	$ 0.92	$ 0.80
Diluted (in dollars per share)	$ 0.90	$ 0.78
Weighted-average shares used to compute earnings per share:
Basic (in shares)	12.2	12.3
Diluted (in shares)	12.4	12.5