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Segment Information - Schedule of Operating Segment Reporting Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]                      
Sales $ 564.3 $ 572.5 $ 609.0 $ 609.9 $ 561.0 $ 540.5 $ 547.5 $ 540.1 $ 2,355.7 $ 2,189.1 $ 1,973.3
Operating income (loss) 97.4 $ 109.9 $ 115.1 $ 102.8 95.8 $ 96.5 $ 96.5 $ 82.4 425.2 371.2 350.6
Depreciation and amortization                 141.7 123.1 104.5
Equity in earnings from affiliated companies                 3.7 5.6 3.3
Other expense (income), net                   7.7  
Segment assets 3,128.6       2,824.1       3,128.6 2,824.1 2,780.9
Investments in affiliated companies 46.5       48.7       46.5 48.7 47.7
Accrual basis additions to property, plant and equipment                 191.0 179.1 284.4
Corporate & Other and Intersegment Elimination                      
Segment Reporting Information [Line Items]                      
Sales                 (84.2) (74.7) (64.0)
Operating income (loss)                 (58.1) (53.2) (57.5)
Depreciation and amortization                 0.1 0.1 0.2
Equity in earnings from affiliated companies                 (0.3)    
Segment assets (6.2)       49.3       (6.2) 49.3 86.3
Investments in affiliated companies 8.2       14.2       8.2 14.2 21.2
Composite Materials                      
Segment Reporting Information [Line Items]                      
Sales                 1,863.1 1,770.5 1,597.1
Composite Materials | Operating Segments                      
Segment Reporting Information [Line Items]                      
Operating income (loss)                 411.3 373.8 359.4
Depreciation and amortization                 126.5 113.9 96.8
Equity in earnings from affiliated companies                 (0.3)    
Segment assets 2,669.6       2,501.9       2,669.6 2,501.9 2,415.5
Investments in affiliated companies 2.2       2.4       2.2 2.4  
Accrual basis additions to property, plant and equipment                 185.8 173.5 270.3
Composite Materials | Intersegment Elimination                      
Segment Reporting Information [Line Items]                      
Sales                 83.4 74.6 63.6
Engineered Products                      
Segment Reporting Information [Line Items]                      
Sales                 492.6 418.6 376.2
Engineered Products | Operating Segments                      
Segment Reporting Information [Line Items]                      
Operating income (loss)                 72.0 50.6 48.7
Depreciation and amortization                 15.1 9.1 7.5
Equity in earnings from affiliated companies                 4.3 5.6 3.3
Other expense (income), net                   7.7  
Segment assets 465.2       272.9       465.2 272.9 279.1
Investments in affiliated companies $ 36.1       $ 32.1       36.1 32.1 26.5
Accrual basis additions to property, plant and equipment                 5.2 5.6 14.1
Engineered Products | Intersegment Elimination                      
Segment Reporting Information [Line Items]                      
Sales                 $ 0.8 $ 0.1 $ 0.4