Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013 item	Dec. 31, 2012	Dec. 31, 2011
Segment Information
Number of reporting segments									2
Segment information
Sales	$ 426.8	$ 412.3	$ 422.6	$ 416.5	$ 387.3	$ 391.6	$ 399.2	$ 400.1	$ 1,678.2	$ 1,578.2	$ 1,392.4
Other (income) expense, net	67.0	69.0	71.9	63.0	54.3	60.0	73.9	60.6	270.9	248.8	192.0
Depreciation									59.3	57.2	55.3
Equity in earnings from affiliated companies									1.3	0.7	1.6
Other income, net							(9.5)			(9.5)	(3.0)
Segment assets	1,836.1				1,603.1				1,836.1	1,603.1	1,376.1
Investments in affiliated companies	23.3				22.6				23.3	22.6	21.7
Accrual basis additions to property, plant and equipment									206.5	241.3	184.5
Composite Materials
Segment information
Other (income) expense, net									276.3	257.3	194.5
Depreciation									54.4	52.6	50.8
Other income, net										(14.5)	(5.7)
Segment assets	1,479.2				1,295.4				1,479.2	1,295.4	1,076.0
Accrual basis additions to property, plant and equipment									194.6	228.6	176.6
Engineered Products
Segment information
Other (income) expense, net									58.9	50.6	51.6
Depreciation									4.7	4.5	4.3
Equity in earnings from affiliated companies									1.3	0.7	1.6
Segment assets	244.0				215.2				244.0	215.2	192.3
Investments in affiliated companies	23.3				22.6				23.3	22.6	21.7
Accrual basis additions to property, plant and equipment									11.9	12.5	6.9
Corporate and Other
Segment information
Other (income) expense, net									(64.3)	(59.1)	(54.1)
Depreciation									0.2	0.1	0.2
Other income, net										5.0	2.7
Segment assets	112.9				92.5				112.9	92.5	107.8
Accrual basis additions to property, plant and equipment										0.2	1.0
Operating Segments | Composite Materials
Segment information
Sales									1,286.9	1,230.9	1,074.5
Operating Segments | Engineered Products
Segment information
Sales									391.3	347.3	317.9
Intersegment Elimination | Composite Materials
Segment information
Sales									68.0	56.8	53.8
Intersegment Elimination | Engineered Products
Segment information
Sales									1.8	2.0	1.6
Intersegment Elimination | Corporate and Other
Segment information
Sales									$ (69.8)	$ (58.8)	$ (55.4)