Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 3,003.8	$ 2,669.8	$ 2,872.3
Cost of products sold	2,193.4	2,001.3	2,052.8
Gross Profit	810.4	668.5	819.5
Selling, general and administrative expenses	521.4	470.7	457.7
Impairment and restructuring charges	4.3	21.7	14.7
Gain (Loss) on Disposition of Business	0.0	0.0	(28.7)
Pension Settlement Charges	0.0	1.6	119.9
Operating Income	284.7	174.5	255.9
Interest expense	(37.1)	(33.5)	(33.4)
Interest income	2.9	1.9	2.7
Continued Dumping And Subsidy Offset Act Receipt Net Of Expenses	0.0	59.6	0.0
Other Nonoperating Income (Expense)	9.4	(0.9)	(7.5)
Income Before Income Taxes	259.9	201.6	217.7
Provision for income taxes	57.6	60.5	26.3
Net Income	202.3	141.1	191.4
Less: Net (loss) income attributable to noncontrolling interest	(1.1)	0.3	2.8
Net Income Attributable to The Timken Company	203.4	140.8	188.6
Income (Loss) from Continuing Operations Attributable to Parent	$ 203.4	$ 140.8	$ 188.6
Net Income per Common Share Attributable to The Timken Company Common Shareholders
Earnings Per Share, Basic	$ 2.62	$ 1.79	$ 2.23
Earnings Per Share, Diluted	2.58	1.78	2.21
Dividends per share (in dollars per share)	$ 1.07	$ 1.04	$ 1.03