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CAPITAL STOCK (Details) - USD ($)
$ / shares in Units, $ in Millions
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]    
Preferred Stock, Shares Authorized 20,000,000 20,000,000
Preferred Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Debt Instrument, Convertible, Carrying Amount of Equity Component $ 344.8  
Common Stock    
Class of Stock [Line Items]    
Common Stock, Shares Authorized 210,000,000 210,000,000
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Common Class B    
Class of Stock [Line Items]    
Common Stock, Shares Authorized 20,000,000 20,000,000
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01