Retirement Benefit Plans (Details) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Pension Settlement Charges	$ 10.3	$ 3.6			$ 11.9	$ 223.2
Pension obligations transferred			$ 575.0
Defined Benefit Plan, Assets Transferred to (from) Plan			$ 635.0
Lump Sum Distributions Paid				$ 30.0
Components of net periodic benefit cost:
Service cost	3.7	4.3			11.0	13.3
Interest cost	9.3	14.6			28.2	45.0
Expected return on plan assets	(10.0)	(20.0)			(30.3)	(61.8)
Amortization of prior service cost	0.5	0.8			1.3	2.2
Amortization of net actuarial loss	4.4	9.0			13.3	28.0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	10.2	3.5			10.6	221.0
Net periodic benefit cost	18.1	12.2			34.1	247.7
Professional Fees					$ 2.2
The Timken Company Canadian Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of Canadian Timken retirees					135
Pension obligations transferred	15.0
Defined Benefit Plan, Assets Transferred to (from) Plan	15.0
Lump Sum Distributions Paid					$ 6.8
Components of net periodic benefit cost:
Professional Fees					1.3
Other Postretirement Benefit Plan [Member]
Components of net periodic benefit cost:
Service cost	0.1	0.1			0.3	0.3
Interest cost	2.7	2.7			8.2	8.1
Expected return on plan assets	(1.6)	(1.8)			(4.9)	(5.3)
Amortization of prior service cost	0.2	0.2			0.7	0.6
Net periodic benefit cost	1.4	1.3			4.3	3.8
Pension Plan, Defined Benefit [Member]
Components of net periodic benefit cost:
Service cost	3.3	3.9			9.9	11.5
Interest cost	6.7	11.4			20.0	35.6
Expected return on plan assets	(7.4)	(15.8)			(22.3)	(49.2)
Amortization of prior service cost	0.4	0.7			1.2	2.1
Amortization of net actuarial loss	3.6	7.8			10.9	24.1
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	0.0	3.5			0.0	219.9
Net periodic benefit cost	6.6	11.5			19.7	244.0
Foreign Pension Plan, Defined Benefit [Member]
Components of net periodic benefit cost:
Service cost	0.4	0.4			1.1	1.8
Interest cost	2.6	3.2			8.2	9.4
Expected return on plan assets	(2.6)	(4.2)			(8.0)	(12.6)
Amortization of prior service cost	0.1	0.1			0.1	0.1
Amortization of net actuarial loss	0.8	1.2			2.4	3.9
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	10.2	0.0			10.6	1.1
Net periodic benefit cost	$ 11.5	$ 0.7			$ 14.4	$ 3.7
Timken-Latrobe-MPB-Torrington Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of U.S. Timken retirees			5,000