Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Net sales	$ 1,463.8	$ 1,378.7	$ 1,203.2
Cost of sales	1,228.6	1,144.2	992.2
Gross profit	235.2	234.5	211.0
Selling, general and administrative expenses	135.1	136.6	120.2
Litigation judgment and settlement costs	2.2	0.0	5.2
Operating income	97.9	97.9	85.6
Gain on acquisition of business	0.0	0.0	(0.6)
Interest expense	27.9	26.1	25.9
Income from continuing operations before income taxes	70.0	71.8	60.3
Income tax expense	21.3	24.9	19.4
Net income from continuing operations	48.7	46.9	40.9
Income from discontinued operations, net of taxes	0.0	0.0	3.0
Net income	48.7	46.9	43.9
Net income attributable to noncontrolling interest	(0.6)	(1.3)	(0.5)
Net income attributable to ParkOhio common shareholders	$ 48.1	$ 45.6	$ 43.4
Earnings per common share attributable to ParkOhio common shareholders - Basic:
Continuing operations (in dollars per share)	$ 3.94	$ 3.77	$ 3.40
Discontinued operations (in dollars per share)	0.00	0.00	0.25
Basic (in dollars per share)	3.94	3.77	3.65
Earnings per common share attributable to ParkOhio common shareholders - Diluted:
Continuing operations (in dollars per share)	3.88	3.68	3.31
Discontinued operations (in dollars per share)	0.00	0.00	0.25
Diluted (in dollars per share)	$ 3.88	$ 3.68	$ 3.56
Weighted-average shares used to compute earnings per share:
Basic (in shares)	12,215,425	12,097,018	11,936,772
Diluted (in shares)	12,382,951	12,376,076	12,232,165
Dividend per common share (in dollars per share)	$ 0.5	$ 0.375	$ 0