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) Income	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2019		15,706,398
Beginning balance at Dec. 31, 2019	$ 349.6	$ 15.7	$ 129.8	$ 298.2	$ (71.1)	$ (37.0)	$ 14.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(14.8)			1.2		(16.1)	0.1
Stock-based compensation expense	1.4		1.4
Stock-based compensation activity (in shares)		1,000
Dividends	(1.6)			(1.6)
Purchase of treasury stock	(2.9)				(2.9)
Payments of withholding taxes on share awards	(0.1)				(0.1)
Ending balance (in shares) at Mar. 31, 2020		15,707,398
Ending balance at Mar. 31, 2020	$ 331.6	$ 15.7	131.2	297.8	(74.1)	(53.1)	14.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchase of treasury stock (in shares)	180,827
Beginning balance (in shares) at Dec. 31, 2019		15,706,398
Beginning balance at Dec. 31, 2019	$ 349.6	$ 15.7	129.8	298.2	(71.1)	(37.0)	14.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(28.5)
Ending balance (in shares) at Jun. 30, 2020		15,991,391
Ending balance at Jun. 30, 2020	$ 316.2	$ 16.0	132.2	281.2	(77.1)	(49.8)	13.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends per common share (in dollars per share)	$ 0.125
Beginning balance (in shares) at Mar. 31, 2020		15,707,398
Beginning balance at Mar. 31, 2020	$ 331.6	$ 15.7	131.2	297.8	(74.1)	(53.1)	14.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(13.7)			(16.6)		3.3	(0.4)
Stock-based compensation expense	1.3		1.3
Stock-based compensation activity (in shares)		283,993
Stock-based compensation activity	0.0	$ 0.3	(0.3)
Dividends	(2.4)
Purchase of treasury stock					(2.4)
Payments of withholding taxes on share awards	(0.6)				(0.6)
Ending balance (in shares) at Jun. 30, 2020		15,991,391
Ending balance at Jun. 30, 2020	$ 316.2	$ 16.0	132.2	281.2	(77.1)	(49.8)	13.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends per common share (in dollars per share)	$ 0
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends per common share (in dollars per share)	$ 0.250
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchase of treasury stock (in shares)	149,376
Dividends per common share (in dollars per share)	$ 0.125