Earnings Per Share - Denominator of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income attributable to The Timken Company	$ 62.9	$ 88.1	$ 104.8	$ 113.3	$ 53.1	$ 88.8	$ 61.9	$ 80.7	$ 369.1	$ 284.5	$ 362.1
Less: undistributed earnings allocated to nonvested stock									0.0	0.0	0.0
Net income available to common shareholders for basic and diluted earnings per share									$ 369.1	$ 284.5	$ 362.1
Denominator:
Weighted-average number of shares outstanding - basic (in shares)									75,885,316	75,354,280	75,758,123
Effect of dilutive securities:
Stock options and awards - based on the treasury stock method (in shares)									1,121,273	1,047,086	1,138,442
Weighted-average number of shares outstanding, assuming dilution of stock options and awards (in shares)									77,006,589	76,401,366	76,896,565
Basic earnings per share (in dollars per share)	$ 0.83	$ 1.16	$ 1.38	$ 1.49	$ 0.70	$ 1.18	$ 0.82	$ 1.07	$ 4.86	$ 3.78	$ 4.78
Diluted earnings per share (in dollars per share)	$ 0.82	$ 1.14	$ 1.36	$ 1.47	$ 0.69	$ 1.16	$ 0.82	$ 1.06	$ 4.79	$ 3.72	$ 4.71