Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Net sales	$ 343.8	$ 328.0
Cost of sales	288.3	280.2
Gross profit	55.5	47.8
Selling, general and administrative expenses	36.6	32.5
Litigation settlement gain	(3.3)	0.0
Asset impairment charge	0.0	4.0
Operating income	22.2	11.3
Interest expense	7.4	7.1
Income before income taxes	14.8	4.2
Income tax expense	4.7	1.5
Net income	10.1	2.7
Net income attributable to noncontrolling interests	(0.3)	0.0
Net income attributable to ParkOhio common shareholders	$ 9.8	$ 2.7
Earnings per common share attributable to ParkOhio common shareholders:
Basic (in dollars per share)	$ 0.80	$ 0.22
Diluted (in dollars per share)	$ 0.79	$ 0.22
Weighted-average shares used to compute earnings per share:
Basic (in shares)	12,203,505	12,076,815
Diluted (in shares)	12,482,379	12,216,592
Dividends per common share (in dollars per share)	$ 0.125	$ 0.125