Acquisitions and Divestitures - Acquisitions Narrative (Details) - USD ($) $ in Millions							3 Months Ended									12 Months Ended
	Oct. 31, 2016	Jul. 08, 2016	Sep. 01, 2015	Apr. 30, 2015	Nov. 30, 2014	Apr. 28, 2014	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Property, plant and equipment							$ 16.5				$ 37.9				$ 2.8	$ 16.5	$ 37.9		$ 2.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other											1.1						1.1
Asset Impairment Charges																3.9	3.3		98.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt							2.2				0.0				0.0	2.2	0.0		0.0
Cash Acquired from Acquisition																2.5	0.1
Net sales							654.8	$ 657.4	$ 673.6	$ 684.0	714.4	$ 707.4	$ 728.0	$ 722.5		2,669.8	2,872.3	$ 20.6	3,076.2
Proceeds from Divestiture of Businesses				$ 2.8							43.4
Payments to Acquire Businesses, Net of Cash Acquired																72.6	213.3		21.7
Goodwill							30.6				$ 70.8				4.7	30.6	$ 70.8		4.7
EDT [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Oct. 31, 2016
Lovejoy [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		Jul. 08, 2016
2016 Acquisitions [Member]
Business Acquisition [Line Items]
Acquisition Costs, Cumulative							74.4									74.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt							2.2									2.2
Cash Acquired from Acquisition																2.5
Business Acquisition, Transaction Costs							$ 1.7									1.7
Net sales																$ 61.0
Timken Belts [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition			Sep. 01, 2015
Acquisition Costs, Cumulative			$ 213.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents			0.1
Business Acquisition, Transaction Costs			1.0
Net sales			$ 140.0
Payments to Acquire Businesses, Net of Cash Acquired												$ 0.7
Revolvo [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition					Nov. 30, 2014
Schulz [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition						Apr. 28, 2014
2014 Acquisitions [Member] [Member]
Business Acquisition [Line Items]
Acquisition Costs, Cumulative															21.7				21.7
Net sales																			$ 26.0
Aerospace Overhaul [Member]
Business Acquisition [Line Items]
Asset Impairment Charges															1.2
Proceeds from Divestiture of Businesses															$ 7.4