Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net sales	$ 312.7	$ 364.4	$ 970.1	$ 1,116.4
Cost of sales	258.4	302.1	813.7	935.3
Gross profit	54.3	62.3	156.4	181.1
Selling, general and administrative expenses	33.4	34.9	99.9	103.8
Asset impairment charge	0.0	0.0	4.0	0.0
Operating income	20.9	27.4	52.5	77.3
Interest expense	7.2	7.0	21.3	20.7
Income before income taxes	13.7	20.4	31.2	56.6
Income tax (benefit) expense	(0.1)	7.2	5.7	19.7
Net income	13.8	13.2	25.5	36.9
Net income attributable to noncontrolling interest	(0.3)	0.0	(0.3)	(0.5)
Net income attributable to ParkOhio common shareholders	$ 13.5	$ 13.2	$ 25.2	$ 36.4
Earnings per common share attributable to ParkOhio common shareholders:
Basic (in dollars per share)	$ 1.12	$ 1.07	$ 2.08	$ 2.98
Diluted (in dollars per share)	$ 1.10	$ 1.06	$ 2.06	$ 2.94
Weighted-average shares used to compute earnings per share:
Basic (in shares)	12,149,384	12,288,392	12,113,058	12,228,721
Diluted (in shares)	12,276,948	12,398,368	12,254,219	12,415,073
Dividends per common share (in dollars per share)	$ 0.125	$ 0.125	$ 0.375	$ 0.375