Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net sales	$ 1,276.9	$ 1,463.8	$ 1,378.7
Cost of sales	1,073.9	1,228.6	1,144.2
Gross profit	203.0	235.2	234.5
Selling, general and administrative expenses	129.8	135.1	136.6
Asset impairment charge	4.0	0.0	0.0
Litigation judgment costs	0.0	2.2	0.0
Operating income	69.2	97.9	97.9
Interest expense	28.2	27.9	26.1
Income before income taxes	41.0	70.0	71.8
Income tax expense	8.8	21.3	24.9
Net income	32.2	48.7	46.9
Net income attributable to noncontrolling interest	(0.5)	(0.6)	(1.3)
Net income attributable to ParkOhio common shareholders	$ 31.7	$ 48.1	$ 45.6
Earnings per common share attributable to ParkOhio common shareholders:
Basic (in dollars per share)	$ 2.62	$ 3.94	$ 3.77
Diluted (in dollars per share)	$ 2.58	$ 3.88	$ 3.68
Weighted-average shares used to compute earnings per share:
Basic (in shares)	12,126,264	12,215,425	12,097,018
Diluted (in shares)	12,274,452	12,382,951	12,376,076
Cash dividends per common share (in dollars per share)	$ 0.5	$ 0.5	$ 0.375