Acquisitions - Additional Information (Details) - USD ($) $ in Millions			3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 06, 2017	Nov. 23, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Weighted average useful life (in years)					9 years 1 month 6 days
Amortization expense			$ 3.8	$ 2.7	$ 11.0	$ 8.0
Anticipated future amortization expense for 2017			3.9		3.9
Anticipated future amortization expense for 2018			15.4		15.4
Anticipated future amortization expense for 2019			15.2		15.2
Anticipated future amortization expense for 2020			11.9		11.9
Anticipated future amortization expense for 2021			11.0		11.0
Diversified Silicone Products, Inc.
Business Acquisition [Line Items]
Consideration transferred	$ 60.2
Anticipated future amortization expense for 2017			0.5		0.5
Anticipated future amortization expense for 2018			1.9		1.9
Anticipated future amortization expense for 2019			1.8		1.8
Anticipated future amortization expense for 2020			1.8		1.8
Anticipated future amortization expense for 2021			1.8		1.8
Business acquisition, acquiree revenue			5.9		16.8
Diversified Silicone Products, Inc. | Revolving Credit Facility
Business Acquisition [Line Items]
Proceeds from line of credit	30.0
DeWAL Industries LLC.
Business Acquisition [Line Items]
Consideration transferred		$ 135.5
Proceeds from line of credit		136.0
Anticipated future amortization expense for 2017			0.7		0.7
Anticipated future amortization expense for 2018			3.7		3.7
Anticipated future amortization expense for 2019			4.1		4.1
Anticipated future amortization expense for 2020			4.3		4.3
Anticipated future amortization expense for 2021			$ 4.3		4.3
Transaction costs					0.1		$ 2.1
Minimum | Diversified Silicone Products, Inc.
Business Acquisition [Line Items]
Amortization expense					1.1
Minimum | DeWAL Industries LLC.
Business Acquisition [Line Items]
Amortization expense					2.4
Maximum | Diversified Silicone Products, Inc.
Business Acquisition [Line Items]
Amortization expense					2.0
Maximum | DeWAL Industries LLC.
Business Acquisition [Line Items]
Amortization expense					$ 4.3
Customer relationships
Business Acquisition [Line Items]
Weighted average useful life (in years)					10 years 4 months 24 days
Customer relationships | Diversified Silicone Products, Inc.
Business Acquisition [Line Items]
Intangible assets acquired	30.5
Weighted average useful life (in years)					11 years 9 months 24 days
Customer relationships | DeWAL Industries LLC.
Business Acquisition [Line Items]
Intangible assets acquired		46.7
Weighted average useful life (in years)					13 years 6 months
Developed Technology Rights | Diversified Silicone Products, Inc.
Business Acquisition [Line Items]
Intangible assets acquired	1.8
Weighted average useful life (in years)					4 years 3 months 18 days
Developed Technology Rights | DeWAL Industries LLC.
Business Acquisition [Line Items]
Intangible assets acquired		22.0
Weighted average useful life (in years)					8 years 7 months 6 days
Trademarks | Diversified Silicone Products, Inc.
Business Acquisition [Line Items]
Intangible assets acquired	3.3
Weighted average useful life (in years)					11 years 8 months 12 days
Trademarks | DeWAL Industries LLC.
Business Acquisition [Line Items]
Intangible assets acquired		4.3
Weighted average useful life (in years)					5 years 2 months 12 days
Covenant-not-to-compete
Business Acquisition [Line Items]
Weighted average useful life (in years)					3 years 4 months 24 days
Covenant-not-to-compete | Diversified Silicone Products, Inc.
Business Acquisition [Line Items]
Intangible assets acquired	$ 0.3
Weighted average useful life (in years)					4 years 1 month 6 days
Covenant-not-to-compete | DeWAL Industries LLC.
Business Acquisition [Line Items]
Intangible assets acquired		$ 0.5
Weighted average useful life (in years)					3 years 9 months 6 days
Selling and Administrative Expenses | Diversified Silicone Products, Inc.
Business Acquisition [Line Items]
Transaction costs					$ 0.5