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Business Combinations - Schedule of Net Assets Acquired (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Jan. 02, 2018
Dec. 31, 2017
Sep. 20, 2017
Jan. 13, 2017
Net assets acquired:          
Goodwill $ 475.0   $ 468.8    
Skaff          
Net assets acquired:          
Goodwill   $ 4.7      
Property, plant and equipment   4.2      
Inventories, net   1.6      
Identifiable intangible assets   1.7      
Other net assets   0.3      
Net assets acquired   $ 12.5      
Hudson          
Net assets acquired:          
Goodwill       $ 238.3  
Property, plant and equipment       29.4  
Inventories, net       26.5  
Identifiable intangible assets       211.0  
Accounts receivable       34.6  
Other current assets       8.1  
Unbilled contract revenue       4.9  
Other assets       2.9  
Prepaid expenses       0.9  
Deferred tax liabilities       (87.6)  
Accounts payable       (21.2)  
Customer advances and billings in excess of contract revenue       (17.4)  
Accrued salaries, wages and benefits       (4.4)  
Other current liabilities       (3.8)  
Other long-term liabilities       (1.9)  
Current portion of warranty reserve       (0.8)  
Net assets acquired       $ 419.5  
Hetsco          
Net assets acquired:          
Goodwill         $ 8.8
Other net assets         4.7
Net assets acquired         22.8
Hetsco | Customer relationships          
Net assets acquired:          
Identifiable intangible assets         8.1
Hetsco | Other identifiable intangible assets          
Net assets acquired:          
Identifiable intangible assets         $ 1.2