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Segment Information - Schedule of Operating Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Sales	$ 561.0	$ 540.5	$ 547.5	$ 540.1	$ 511.7	$ 491.5	$ 491.3	$ 478.8	$ 2,189.1	$ 1,973.3	$ 2,004.3
Operating income (loss)	95.8	$ 96.5	$ 96.5	$ 82.4	93.2	$ 89.1	$ 89.7	$ 78.6	371.2	350.6	360.1
Depreciation and Amortization									123.1	104.5	93.3
Equity in earnings from affiliated companies									5.6	3.3	2.5
Other expense (income), net									7.7
Segment assets	2,824.1				2,780.9				2,824.1	2,780.9	2,400.6
Investments in affiliated companies	48.7				47.7				48.7	47.7	53.1
Accrual basis additions to property, plant and equipment									179.1	284.4	320.2
Corporate & Other and Intersegment Elimination
Segment Reporting Information [Line Items]
Sales									(74.7)	(64.0)	(67.7)
Operating income (loss)									(53.2)	(57.5)	(58.2)
Depreciation and Amortization									0.1	0.2	0.1
Segment assets	49.3				86.3				49.3	86.3	52.7
Investments in affiliated companies	14.2				21.2				14.2	21.2	30.0
Accrual basis additions to property, plant and equipment											0.1
Composite Materials
Segment Reporting Information [Line Items]
Sales									1,770.5	1,597.1	1,610.0
Composite Materials | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									373.8	359.4	368.3
Depreciation and Amortization									113.9	96.8	86.0
Segment assets	2,501.9				2,415.5				2,501.9	2,415.5	2,127.2
Investments in affiliated companies	2.4								2.4
Accrual basis additions to property, plant and equipment									173.5	270.3	305.2
Composite Materials | Intersegment Elimination
Segment Reporting Information [Line Items]
Sales									74.6	63.6	67.6
Engineered Products
Segment Reporting Information [Line Items]
Sales									418.6	376.2	394.3
Engineered Products | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									50.6	48.7	50.0
Depreciation and Amortization									9.1	7.5	7.2
Equity in earnings from affiliated companies									5.6	3.3	2.5
Other expense (income), net									7.7
Segment assets	272.9				279.1				272.9	279.1	220.7
Investments in affiliated companies	$ 32.1				$ 26.5				32.1	26.5	23.1
Accrual basis additions to property, plant and equipment									5.6	14.1	14.9
Engineered Products | Intersegment Elimination
Segment Reporting Information [Line Items]
Sales									$ 0.1	$ 0.4	$ 0.1

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