Impairment and Restructuring Charges - Narrative (Details) $ in Millions	3 Months Ended						9 Months Ended	12 Months Ended
	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2016 Positions	Dec. 31, 2016 USD ($) Positions	Dec. 31, 2015 USD ($) Positions	Dec. 31, 2014 USD ($)
Restructuring and Related Cost [Line Items]
Current Fiscal Year End Date									--12-31
Goodwill, Impairment Loss						$ 86.3
Goodwill and Intangible Asset Impairment						9.9
Severance expense and related benefit costs	$ 3.3	$ 7.7	$ 4.3	$ 0.4				$ 15.3	$ 7.7	$ 10.7
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments								26.6	461.8
Impairment charges								3.9	3.3	98.9
Exit costs	$ 0.8	$ 0.2	0.1	$ 3.1				2.5	3.7	3.8
Restructuring Reserve			$ 11.3		$ 9.5			$ 10.1	$ 11.3	9.5
Document Fiscal Year Focus								2016
WorkforceReduction [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Expected Number of Positions Eliminated | Positions								175	100
Severance expense and related benefit costs								$ 9.4	$ 6.5
Pulaski [Member] | WorkforceReduction [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Expected Number of Positions Eliminated | Positions							120
Severance expense and related benefit costs								2.5
Mobile Industries [Member]
Restructuring and Related Cost [Line Items]
Severance expense and related benefit costs								9.3	4.5	9.3
Impairment charges								3.9	0.1	98.2
Exit costs								1.8	0.8	2.0
Mobile Industries [Member] | WorkforceReduction [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Expected Number of Positions Eliminated | Positions							85
Severance expense and related benefit costs								3.8	3.4
Mobile Industries [Member] | UNITED KINGDOM
Restructuring and Related Cost [Line Items]
Severance expense and related benefit costs					$ 3.7
Exit costs								0.9
Mobile Industries [Member] | Europe [Member]
Restructuring and Related Cost [Line Items]
Severance expense and related benefit costs									1.2	2.9
Aerospace and Defense [Member]
Restructuring and Related Cost [Line Items]
Goodwill and Intangible Asset Impairment						86.3
Aerospace Overhaul [Member]
Restructuring and Related Cost [Line Items]
Goodwill and Intangible Asset Impairment						1.2
Severance expense and related benefit costs						$ 0.3
Process Industries [Member]
Restructuring and Related Cost [Line Items]
Severance expense and related benefit costs								6.0	2.6	1.4
Impairment charges								0.0	3.2	0.3
Exit costs								0.7	2.9	1.8
Process Industries [Member] | WorkforceReduction [Member]
Restructuring and Related Cost [Line Items]
Severance expense and related benefit costs								5.6	2.5
Process Industries [Member] | South America [Member]
Restructuring and Related Cost [Line Items]
Exit costs									2.9
Benoni [Member]
Restructuring and Related Cost [Line Items]
Goodwill and Intangible Asset Impairment								0.5
Benoni [Member] | WorkforceReduction [Member]
Restructuring and Related Cost [Line Items]
Severance expense and related benefit costs								1.1
Altavista Bearing Plant [Member] [Member]
Restructuring and Related Cost [Line Items]
Goodwill and Intangible Asset Impairment								3.1
Severance expense and related benefit costs								1.9
Corporate Segment [Member]
Restructuring and Related Cost [Line Items]
Severance expense and related benefit costs								0.0	0.6	0.0
Impairment charges								0.0	0.0	0.4
Exit costs								$ 0.0	0.0	$ 0.0
Corporate Segment [Member] | WorkforceReduction [Member]
Restructuring and Related Cost [Line Items]
Severance expense and related benefit costs									0.6
Repair Business [Member] | Process Industries [Member] | UNITED STATES
Restructuring and Related Cost [Line Items]
Impairment charges									$ 3.0