Acquisitions and Divestitures - Acquisitions Narrative (Details) - USD ($) $ in Millions									3 Months Ended									12 Months Ended
	Jul. 05, 2017	Jul. 03, 2017	May 05, 2017	Apr. 03, 2017	Oct. 31, 2016	Jul. 08, 2016	Sep. 01, 2015	Apr. 30, 2015	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2015
Business Acquisition [Line Items]
Property, plant and equipment																	$ 37.9			$ 37.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other																	1.1			1.1
Asset Impairment Charges																		$ 0.1	$ 3.9	3.3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt																	0.0			0.0
Cash Acquired from Acquisition																		35.0	2.5	0.1
Net sales									$ 778.0	$ 771.4	$ 750.6	$ 703.8	$ 654.8	$ 657.4	$ 673.6	$ 684.0		3,003.8	2,669.8	2,872.3	$ 20.6
Proceeds from Divestiture of Businesses								$ 2.8									43.4
Goodwill																	$ 70.8			70.8
Groeneveld [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		Jul. 03, 2017
EDT [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition					Oct. 31, 2016
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred																		0.6
Lovejoy [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition						Jul. 08, 2016
2016 Acquisitions [Member]
Business Acquisition [Line Items]
Property, plant and equipment													16.5						16.5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other													5.3						5.3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt													2.2						2.2
Cash Acquired from Acquisition																			1.9
Business Combination, Acquisition Related Costs																			1.7
Goodwill													$ 30.6						30.6
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period																			61.0
Business Combination, Consideration Transferred																			$ 74.7
Timken Belts [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition							Sep. 01, 2015
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred															$ 0.7
Cash Acquired from Acquisition																				0.1
Business Combination, Acquisition Related Costs																				1.0
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period																				140.0
Business Combination, Consideration Transferred																				$ 213.7
PT Tech [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition			May 05, 2017
Torsion Control Products [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition				Apr. 03, 2017
2017 Acquisitions [Member]
Business Acquisition [Line Items]
Property, plant and equipment									31.5									31.5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other									3.3									3.3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt									2.9									2.9
Cash Acquired from Acquisition																		35.4
Business Combination, Acquisition Related Costs																		3.7
Goodwill									$ 149.7									149.7
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period																		146.2
Business Combination, Consideration Transferred																		346.2
ABC Bearings [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Jul. 05, 2017
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period																		$ 29.0