STOCK-BASED COMPENSATION - SCHEDULE OF OUSTANDING UNVESTED RSUs AND PSUs (Details)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
RSUs
Number of Shares
Balance at beginning of the period (in shares) | shares	750,000
Granted (in shares) | shares	649,000
Vested (in shares) | shares	(241,000)
Forfeited (in shares) | shares	(16,000)
Balance at end of the period (in shares) | shares	1,142,000
Weighted Average Grant Date Fair Value
Balance at beginning of the period (in usd per share) | $ / shares	$ 53.61
Granted (in usd per share) | $ / shares	70.11
Vested (in usd per share) | $ / shares	50.44
Forfeited (in usd per share) | $ / shares	71.39
Balance at end of the period (in usd per share) | $ / shares	$ 63.42
PSUs
Number of Shares
Balance at beginning of the period (in shares) | shares	35,000
Granted (in shares) | shares	168,000
Vested (in shares) | shares	0
Forfeited (in shares) | shares	(33,000)
Balance at end of the period (in shares) | shares	170,000
Weighted Average Grant Date Fair Value
Balance at beginning of the period (in usd per share) | $ / shares	$ 71.39
Granted (in usd per share) | $ / shares	70.88
Vested (in usd per share) | $ / shares	0.00
Forfeited (in usd per share) | $ / shares	71.39
Balance at end of the period (in usd per share) | $ / shares	$ 70.89
Vesting period (in years)	3 years