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ACQUISITIONS - Fair Value of Debt Obligations (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Apr. 01, 2015
Convertible Debt    
Debt Instrument [Line Items]    
Long-term debt, amount recognized as of acquisition date   $ 3,123.1
Convertible Debt | 1.5% Convertible Notes Due March 2019    
Debt Instrument [Line Items]    
Long-term debt, amount recognized as of acquisition date   $ 1,837.1
Stated interest rate on debt (as a percent)   1.50%
Convertible Debt | 2.75% Convertible Notes Due May 2015    
Debt Instrument [Line Items]    
Long-term debt, amount recognized as of acquisition date   $ 1,286.0
Stated interest rate on debt (as a percent)   2.75%
Salix    
Debt Instrument [Line Items]    
Long-term debt, amount recognized as of acquisition date $ 3,123.1  
Salix | Convertible Debt | 1.5% Convertible Notes Due March 2019    
Debt Instrument [Line Items]    
Stated interest rate on debt (as a percent) 1.50% 1.50%
Salix | Convertible Debt | 2.75% Convertible Notes Due May 2015    
Debt Instrument [Line Items]    
Stated interest rate on debt (as a percent)   2.75%