Condensed Consolidated Statement of Shareholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Noncontrolling Interest
Beginning balance at Dec. 31, 2020	$ 367.0	$ 0.0	$ 133.4	$ 237.9	$ (18.1)	$ 13.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	1.5			5.7	(4.1)	(0.1)
Stock-based compensation expense	1.6		1.6
Dividend paid to parent	(2.0)			(2.0)
Increase in Park-Ohio ownership interest	0.0		1.1			(1.1)
Ending balance at Mar. 31, 2021	368.1	0.0	136.1	241.6	(22.2)	12.6
Beginning balance at Dec. 31, 2020	367.0	0.0	133.4	237.9	(18.1)	13.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(14.6)
Ending balance at Sep. 30, 2021	350.6	0.0	139.2	224.9	(25.7)	12.2
Beginning balance at Mar. 31, 2021	368.1	0.0	136.1	241.6	(22.2)	12.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(3.6)			(5.2)	1.8	(0.2)
Stock-based compensation expense	1.4		1.4
Dividend paid to parent	(2.0)			(2.0)
Ending balance at Jun. 30, 2021	363.9	0.0	137.5	234.4	(20.4)	12.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(12.5)			(7.0)	(5.3)	(0.2)
Stock-based compensation expense	1.7		1.7
Dividend paid to parent	(2.5)			(2.5)
Ending balance at Sep. 30, 2021	350.6	0.0	139.2	224.9	(25.7)	12.2
Beginning balance at Dec. 31, 2021	336.0	0.0	137.7	206.7	(19.2)	10.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	3.4			6.3	(3.1)	0.2
Stock-based compensation expense	1.6		1.6
Dividend paid to parent	(1.5)			(1.5)
Ending balance at Mar. 31, 2022	339.5	0.0	139.3	211.5	(22.3)	11.0
Beginning balance at Dec. 31, 2021	336.0	0.0	137.7	206.7	(19.2)	10.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(23.4)
Ending balance at Sep. 30, 2022	312.4	0.0	143.1	212.0	(54.0)	11.3
Beginning balance at Mar. 31, 2022	339.5	0.0	139.3	211.5	(22.3)	11.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(13.1)			1.2	(14.8)	0.5
Stock-based compensation expense	1.8		1.8
Dividend paid to parent	(2.0)			(2.0)
Ending balance at Jun. 30, 2022	326.2	0.0	141.1	210.7	(37.1)	11.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(13.7)			2.8	(16.9)	0.4
Stock-based compensation expense	2.0		2.0
Dividend paid to parent	(1.5)			(1.5)
Dividend	(0.6)					(0.6)
Ending balance at Sep. 30, 2022	$ 312.4	$ 0.0	$ 143.1	$ 212.0	$ (54.0)	$ 11.3