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Revenue (Summary of Disaggregation of Revenue by Product Line) (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
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Total revenues $ 405.9 $ 414.3 $ 432.2 $ 405.7 $ 366.0 $ 352.2 $ 350.9 $ 343.8 $ 1,658.1 $ 1,412.9 $ 1,276.9
Supply Technologies Segment                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Total revenues                 636.8 561.8  
Assembly Components Segment                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Total revenues                 578.3 524.5  
Engineered Products Segment                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Total revenues                 443.0 326.6  
Supply Technologies | Supply Technologies Segment                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Total revenues                 555.3 479.2  
Engineered specialty products | Supply Technologies Segment                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Total revenues                 81.5 82.6  
Fuel-related, rubber and plastic products | Assembly Components Segment                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Total revenues                 382.5 366.3  
Aluminum products | Assembly Components Segment                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Total revenues                 195.8 158.2  
Industrial equipment | Engineered Products Segment                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Total revenues                 312.1 274.4  
Forged and machined products | Engineered Products Segment                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Total revenues                 $ 130.9 $ 52.2