Retirement Benefit Plans (Details) $ in Millions	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($)	Dec. 31, 2015	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Pension Settlement Charges	$ 0.4		$ 4.4		$ 1.6	$ 219.6
Pension obligations transferred				$ 575.0
Defined Benefit Plan, Assets Transferred to (from) Plan				$ 635.0
Lump Sum Distributions Paid						19.0
Components of net periodic benefit cost:
Service cost	3.6		4.5		7.3	9.0
Interest cost	9.4		14.4		18.9	30.4
Expected return on plan assets	(10.1)		(19.7)		(20.3)	(41.8)
Amortization of prior service cost	0.4		0.5		0.8	1.4
Amortization of net actuarial loss	4.4		8.0		8.9	19.0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	0.4		3.9		0.4	217.5
Net periodic benefit cost	8.1		11.6		16.0	235.5
Professional Fees						2.1
The Timken Company Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of U.S. Timken retirees		3,400
Other Postretirement Benefit Plan [Member]
Components of net periodic benefit cost:
Service cost	0.1		0.1		0.2		$ 0.2
Interest cost	2.8		2.7		5.5		5.4
Expected return on plan assets	(1.7)		(1.7)		(3.3)		(3.5)
Amortization of prior service cost	0.3		0.2		0.5		$ 0.4
Net periodic benefit cost	1.5		1.3		2.9	2.5
Pension Plan, Defined Benefit [Member]
Components of net periodic benefit cost:
Service cost	3.3		3.8		6.6	7.6
Interest cost	6.6		11.3		13.3	24.2
Expected return on plan assets	(7.4)		(15.6)		(14.9)	(33.4)
Amortization of prior service cost	0.4		0.5		0.8	1.4
Amortization of net actuarial loss	3.6		6.7		7.3	16.3
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	0.0		2.8		0.0	216.4
Net periodic benefit cost	6.5		9.5		13.1	232.5
Foreign Pension Plan, Defined Benefit [Member]
Components of net periodic benefit cost:
Service cost	0.3		0.7		0.7	1.4
Interest cost	2.8		3.1		5.6	6.2
Expected return on plan assets	(2.7)		(4.1)		(5.4)	(8.4)
Amortization of prior service cost	0.0		0.0		0.0	0.0
Amortization of net actuarial loss	0.8		1.3		1.6	2.7
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	0.4		1.1		0.4	1.1
Net periodic benefit cost	$ 1.6		$ 2.1		$ 2.9	$ 3.0
Timken-Latrobe-MPB-Torrington Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of U.S. Timken retirees				5,000