Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net sales	$ 352.2		$ 312.7		$ 1,046.9	$ 970.1
Cost of sales	295.0		258.4		873.9	813.7
Gross profit	57.2		54.3		173.0	156.4
Selling, general and administrative expenses	36.2		33.2		108.8	99.0
Litigation settlement gain	0.0	$ (3.3)	0.0		(3.3)	0.0
Asset impairment charge	0.0		0.0	$ 4.0	0.0	4.0
Operating income (loss)	21.0		21.1		67.5	53.4
Interest expense	7.8		7.2		23.1	21.3
Loss on extinguishment of debt	0.0		0.0		11.0	0.0
Income (loss) before income taxes	13.2		13.9		33.4	32.1
Income tax expense	2.8		0.0		9.6	6.1
Net income (loss)	10.4		13.9		23.8	26.0
Net income attributable to noncontrolling interests	(0.2)		(0.3)		(0.7)	(0.3)
Net income attributable to Park-Ohio Industries Inc. common shareholder	$ 10.2		$ 13.6		$ 23.1	$ 25.7