Segment Information - Schedule of Operating Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	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, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Sales	$ 483.5	$ 500.5	$ 522.6	$ 497.7	$ 464.9	$ 448.8	$ 475.7	$ 471.8	$ 2,004.3	$ 1,861.2	$ 1,855.5
Operating income (loss)	87.0	$ 89.1	$ 100.1	$ 83.9	81.2	$ 78.0	$ 90.6	$ 82.6	360.1	332.4	305.8
Depreciation and amortization									93.3	76.4	71.2
Equity in earnings from affiliated companies									2.5	2.0	1.4
Other expense (income), net											6.0
Segment assets	2,400.6				2,187.4				2,400.6	2,187.4	2,036.4
Investments in affiliated companies	53.1				30.4				53.1	30.4	34.2
Accrual basis additions to property, plant and equipment									320.2	289.0	270.2
Corporate & Other and Intersegment Elimination
Segment Reporting Information [Line Items]
Sales									(67.7)	(78.9)	(68.5)
Operating income (loss)									(58.2)	(59.6)	(70.0)
Depreciation and amortization									0.1	0.3	0.2
Other expense (income), net											6.0
Segment assets	52.7				56.0				52.7	56.0	194.6
Investments in affiliated companies	30.0								30.0
Accrual basis additions to property, plant and equipment									0.1
Composite Materials
Segment Reporting Information [Line Items]
Sales									1,610.0	1,458.7	1,420.9
Composite Materials | Intersegment Elimination
Segment Reporting Information [Line Items]
Sales									67.6	70.4	66.7
Composite Materials | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									368.3	336.2	308.8
Depreciation and amortization									86.0	70.0	65.5
Equity in earnings from affiliated companies										0.2
Segment assets	2,127.2				1,892.0				2,127.2	1,892.0	1,600.7
Investments in affiliated companies					10.1					10.1	10.2
Accrual basis additions to property, plant and equipment									305.2	276.0	260.1
Engineered Products
Segment Reporting Information [Line Items]
Sales									394.3	402.5	434.6
Engineered Products | Intersegment Elimination
Segment Reporting Information [Line Items]
Sales									0.1	8.5	1.8
Engineered Products | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									50.0	55.8	67.0
Depreciation and amortization									7.2	6.1	5.5
Equity in earnings from affiliated companies									2.5	1.8	1.4
Segment assets	220.7				239.4				220.7	239.4	241.1
Investments in affiliated companies	$ 23.1				$ 20.3				23.1	20.3	24.0
Accrual basis additions to property, plant and equipment									$ 14.9	$ 13.0	$ 10.1