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Divestitures - Narrative (Details)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Jul. 22, 2019
USD ($)
Jun. 03, 2019
USD ($)
facility
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Number of facilities sold | facility             2
Proceeds from sale of businesses, net of transaction costs     $ 33.4 $ 0.0      
Goodwill   $ 524.8 524.8   $ 534.7    
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal     $ (7.7) $ 0.0      
Forged Products              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Consideration received             $ 37.0
Proceeds from sale of businesses, net of transaction costs   33.4          
Goodwill             $ 10.4
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal   $ (7.7)          
Prior year revenue from facilities sold         86.0    
Cast Products              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Prior year revenue from facilities sold         $ 105.0    
Subsequent Event | Cast Products              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Consideration received           $ 127.0  
Proceeds from sale of businesses, net of transaction costs $ 123.0            
Minimum | Subsequent Event | Cast Products              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal 7.0            
Maximum | Subsequent Event | Cast Products              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal $ 10.0