Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net income attributable to The Timken Company	$ 104.8	$ 61.9	$ 218.1	$ 142.6
Less: undistributed earnings allocated to nonvested stock	0.0	0.0	0.0	0.0
Net income available to common shareholders for basic and diluted earnings per share	$ 104.8	$ 61.9	$ 218.1	$ 142.6
Denominator:
Weighted-average number of shares outstanding - basic (in shares)	76,122,257	75,078,207	75,969,569	75,298,356
Stock options and awards - based on the treasury stock method (in shares)	1,131,900	620,082	1,288,192	733,693
Weighted-average number of shares outstanding, assuming dilution of stock options and awards (in shares)	77,254,157	75,698,289	77,257,761	76,032,049
Basic earnings per share (in dollars per share)	$ 1.38	$ 0.82	$ 2.87	$ 1.89
Diluted earnings per share (in dollars per share)	$ 1.36	$ 0.82	$ 2.82	$ 1.88
Antidilutive stock options outstanding	0	1,338,686	0	1,353,254