Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net income attributable to The Timken Company	$ 88.1	$ 88.8	$ 306.2	$ 231.4
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	$ 88.1	$ 88.8	$ 306.2	$ 231.4
Denominator:
Weighted-average number of shares outstanding - basic (in shares)	76,068,582	75,223,462	75,980,355	75,288,567
Stock options and awards - based on the treasury stock method (in shares)	955,391	1,062,674	1,177,259	843,353
Weighted-average number of shares outstanding, assuming dilution of stock options and awards (in shares)	77,023,973	76,286,136	77,157,614	76,131,920
Basic earnings per share (in dollars per share)	$ 1.16	$ 1.18	$ 4.03	$ 3.07
Diluted earnings per share (in dollars per share)	$ 1.14	$ 1.16	$ 3.97	$ 3.04
Antidilutive stock options outstanding	0	0	0	902,169
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock options outstanding	0	0	0	902,169