Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income attributable to The Timken Company	$ 113.3	$ 80.7
Less: undistributed earnings allocated to nonvested stock	0.0	0.0
Net income available to common shareholders for basic and diluted earnings per share	$ 113.3	$ 80.7
Denominator:
Weighted-average number of shares outstanding - basic (in shares)	75,820,157	75,461,254
Stock options and awards - based on the treasury stock method (in shares)	1,444,484	847,302
Weighted-average number of shares outstanding, assuming dilution of stock options and awards (in shares)	77,264,641	76,308,556
Basic earnings per share (in dollars per share)	$ 1.49	$ 1.07
Diluted earnings per share (in dollars per share)	$ 1.47	$ 1.06
Antidilutive stock options outstanding	0	1,367,821