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Acquisitions (Summary of allocation of purchase price) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Feb. 02, 2018
Feb. 01, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill $ 102.1     $ 100.2
Canton Drop Forge        
Business Acquisition [Line Items]        
Net working capital     $ 20.5  
Property, plant and equipment     15.8  
Intangible assets     7.0  
Goodwill     5.0  
Net pension liability     (4.0)  
Other long-term liabilities, including deferred income tax liabilities     (8.7)  
Total purchase price (net of cash acquired of $1.2 million)     $ 35.6  
Cash acquired in acquisition   $ 1.2