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CONTINGENCIES AND COMMITMENTS (Detail) - USD ($)
$ in Millions
3 Months Ended
Oct. 10, 2013
Mar. 31, 2017
Mar. 29, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]        
Surety Bond Outstanding   $ 56.0    
Damages sought   1,000.0    
Failure to Meet Contractual Obligations [Member]        
Loss Contingencies [Line Items]        
Damages sought $ 25.0      
Standby Letters Of Credit [Member]        
Loss Contingencies [Line Items]        
Letters of credit, outstanding   51.6   $ 47.2
FinancialStandbyLetterOfCreditMember        
Loss Contingencies [Line Items]        
Letters of credit, outstanding   13.7   $ 12.8
Minimum [Member]        
Loss Contingencies [Line Items]        
Range of possible loss, maximum   0.0    
Maximum [Member]        
Loss Contingencies [Line Items]        
Range of possible loss, maximum   $ 56.0    
Westinghouse Electric Company (WEC) [Member] | Collectibility of Receivables [Member]        
Loss Contingencies [Line Items]        
Range of possible loss, maximum     $ 8.0  
Pending Litigation [Member] | Westinghouse Electric Company (WEC) [Member]        
Loss Contingencies [Line Items]        
Debtor-in-Possession Financing, Amount Arranged     $ 800.0