Condensed Consolidated Statements 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, 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)	(2.4)
Ending balance (in shares) at Jun. 30, 2021		16,316,870
Ending balance at Jun. 30, 2021	353.2	$ 16.3	139.4	287.6	(82.0)	(20.4)	12.3
Beginning balance (in shares) at Mar. 31, 2021		16,142,124
Beginning balance at Mar. 31, 2021	359.1	$ 16.1	138.2	294.4	(79.9)	(22.2)	12.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(3.7)			(5.3)		1.8	(0.2)
Stock-based compensation expense	1.4		1.4
Stock-based compensation activity (in shares)		174,746
Stock-based compensation activity	0.0	$ 0.2	(0.2)
Dividends	(1.5)			(1.5)
Payments of withholding taxes on share awards	(2.1)				(2.1)
Ending balance (in shares) at Jun. 30, 2021		16,316,870
Ending balance at Jun. 30, 2021	353.2	$ 16.3	139.4	287.6	(82.0)	(20.4)	12.3
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
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)	(10.1)
Ending balance (in shares) at Jun. 30, 2022		16,642,841
Ending balance at Jun. 30, 2022	313.8	$ 16.6	146.0	263.3	(86.4)	(37.1)	11.4
Beginning balance (in shares) at Mar. 31, 2022		16,334,220
Beginning balance at Mar. 31, 2022	327.9	$ 16.3	144.5	263.9	(85.4)	(22.3)	10.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(13.3)			1.0		(14.8)	0.5
Stock-based compensation expense	1.8		1.8
Stock-based compensation activity (in shares)		308,621
Stock-based compensation activity	0.0	$ 0.3	(0.3)
Dividends	(1.6)			(1.6)
Payments of withholding taxes on share awards	(1.0)				(1.0)
Ending balance (in shares) at Jun. 30, 2022		16,642,841
Ending balance at Jun. 30, 2022	$ 313.8	$ 16.6	$ 146.0	$ 263.3	$ (86.4)	$ (37.1)	$ 11.4