Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 80.5	$ 38.1
Other comprehensive income, net of tax:
Foreign currency translation adjustments	8.4	20.4
Pension and postretirement liability adjustment (net of the income tax benefit of $1.5 million)	0.0	0.1
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	0.8	(0.8)
Other comprehensive income	9.2	19.7
Comprehensive Income	89.7	57.8
Less: comprehensive (loss) income attributable to noncontrolling interest	(0.3)	2.5
Comprehensive Income attributable to The Timken Company	$ 90.0	$ 55.3