Condensed Consolidated Statement of Shareholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2020		16,148,791
Beginning balance at Dec. 31, 2020	$ 357.9	$ 16.1	$ 135.5	$ 290.5	$ (79.8)	$ (18.1)	$ 13.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	1.3			5.5		(4.1)	(0.1)
Stock-based compensation expense	1.6		1.6
Stock-based compensation activity (in shares)		(6,667)
Dividends	(1.6)			(1.6)
Increase in Park-Ohio ownership interest	0.0		1.1				(1.1)
Payments of withholding taxes on share awards	(0.1)				(0.1)
Ending balance (in shares) at Mar. 31, 2021		16,142,124
Ending balance at Mar. 31, 2021	359.1	$ 16.1	138.2	294.4	(79.9)	(22.2)	12.5
Beginning balance (in shares) at Dec. 31, 2021		16,339,722
Beginning balance at Dec. 31, 2021	324.8	$ 16.3	142.9	259.4	(85.3)	(19.2)	10.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	3.2			6.1		(3.1)	0.2
Stock-based compensation expense	1.6		1.6
Stock-based compensation activity (in shares)		(5,502)
Dividends	(1.6)			(1.6)
Payments of withholding taxes on share awards	(0.1)				(0.1)
Ending balance (in shares) at Mar. 31, 2022		16,334,220
Ending balance at Mar. 31, 2022	$ 327.9	$ 16.3	$ 144.5	$ 263.9	$ (85.4)	$ (22.3)	$ 10.9