Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales	$ 405.7	$ 343.8
Cost of sales	340.6	288.8
Gross profit	65.1	55.0
Selling, general and administrative expenses	43.0	37.8
Litigation settlement gain	0.0	(3.3)
Operating income	22.1	20.5
Other components of net pension income	2.3	1.7
Interest expense	(8.4)	(7.4)
Income before income taxes	16.0	14.8
Income tax expense	(5.8)	(4.7)
Net income	10.2	10.1
Net income attributable to noncontrolling interests	(0.4)	(0.3)
Net income attributable to Park-Ohio Holdings Corp. common shareholders	$ 9.8	$ 9.8
Earnings per common share attributable to Park-Ohio Holdings Corp. common shareholders:
Basic (in dollars per share)	$ 0.80	$ 0.80
Diluted (in dollars per share)	$ 0.78	$ 0.79
Weighted-average shares used to compute earnings per share:
Basic (in shares)	12.3	12.2
Diluted (in shares)	12.5	12.5
Dividends per common share (in dollars per share)	$ 0.125	$ 0.125