Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended								12 Months Ended
	Mar. 07, 2016	Sep. 30, 2013	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Net sales			$ 347.4	$ 364.4	$ 377.3	$ 374.7	$ 373.0	$ 344.6	$ 343.3	$ 317.8	$ 1,463.8	$ 1,378.7	$ 1,203.2
Gross profit			54.1	62.3	60.4	58.4	56.9	60.6	61.0	56.0	235.2	234.5	211.0
Net income			11.8	13.2	12.6	11.1	11.2	12.5	12.9	10.3	48.7	46.9	40.9
Net income attributable to noncontrolling interest			(0.1)	0.0	(0.2)	(0.3)	(0.5)	(0.1)	(0.5)	0.0	(0.6)	(1.3)	(0.5)
Net income attributable to ParkOhio common shareholders			$ 11.7	$ 13.2	$ 12.4	$ 10.8	$ 10.7	$ 12.4	$ 12.4	$ 10.1	$ 48.1	$ 45.6	$ 43.4
Earnings per common share attributable to ParkOhio common shareholders:
Basic (in dollars per share)			$ 0.96	$ 1.07	$ 1.02	$ 0.89	$ 0.88	$ 1.02	$ 1.02	$ 0.84	$ 3.94	$ 3.77	$ 3.65
Diluted (in dollars per share)			0.95	1.06	1.00	0.87	0.86	1.00	1.00	0.82	3.88	3.68	3.56
Cash dividends per common share (in dollars per share)			$ 0.125000	$ 0.125000	$ 0.125000	$ 0.125	$ 0.125000	$ 0.125000	$ 0.125000	$ 0	$ 0.5	$ 0.375	$ 0
TMK IPSCO
Condensed Financial Statements, Captions [Line Items]
Damages awarded		$ 5.2
TMK IPSCO | Subsequent Event
Condensed Financial Statements, Captions [Line Items]
Damages awarded	$ 2.2