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SHARE-BASED COMPENSATION - Summary of stock option activity (Details) - Stock options - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Number of Shares      
Outstanding at the beginning of the period (in shares)   13,172,626  
Granted (in shares)   2,697,610  
Exercised (in shares)   (2,550,665)  
Forfeited (in shares)   (340,765)  
Outstanding at the end of the period (in shares)   12,978,806 13,172,626
Exercisable at the end of the period (in shares)   8,065,860  
Weighted Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share)   $ 22.32  
Granted (in dollars per share)   67.88  
Exercised (in dollars per share)   17.91  
Forfeited (in dollars per share)   52.94  
Outstanding at the end of the period (in dollars per share)   31.86 $ 22.32
Exercisable at the end of the period (in dollars per share)   19.34  
Additional disclosures      
Weighted average grant-date fair value of stock options granted (in dollars per share) $ 16.27 $ 28.88 $ 21.44
Aggregate intrinsic value of stock options exercised $ 65.6 $ 127.7 $ 114.5
Stock options expected to vest      
Stock options expected to vest (in shares)   4,700,000  
Weighted average exercise price (in dollars per share)   $ 51.94  
Weighted average contractual remaining life   8 years 4 months 24 days  
Aggregate intrinsic value   $ 128.8  
Additional disclosures      
Aggregate intrinsic value of stock options exercisable   $ 484.3  
Weighted average remaining contractual term of stock options exercisable   5 years  
Unrecognized compensation cost   $ 61.3  
Weighted average period for unrecognized compensation cost expected to be recognized   2 years 1 month 6 days  
Cash received from option exercises $ 49.1 $ 45.0 $ 47.6