EQUITY AND SHARE-BASED COMPENSATION (Details) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended						6 Months Ended												3 Months Ended		6 Months Ended		38 Months Ended		6 Months Ended
	Mar. 31, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	May 07, 2013	Dec. 31, 2012	Jun. 30, 2013 Minimum	Jun. 30, 2013 Maximum	Jun. 30, 2013 Black-Scholes	Jun. 30, 2012 Black-Scholes	Jun. 30, 2013 Black-Scholes Minimum	Jun. 30, 2012 Black-Scholes Minimum	Jun. 30, 2013 Black-Scholes Maximum	Jun. 30, 2012 Black-Scholes Maximum	Jun. 30, 2013 Binomial	Jun. 30, 2012 Binomial	Jun. 30, 2013 Binomial Minimum	Jun. 30, 2012 Binomial Minimum	Jun. 30, 2013 Binomial Maximum	Jun. 30, 2012 Binomial Maximum	Jun. 30, 2013 Stock Repurchase Programs	Jun. 30, 2012 Stock Repurchase Programs	Jun. 30, 2013 Stock Repurchase Programs	Jun. 30, 2012 Stock Repurchase Programs	Jun. 30, 2013 Stock Repurchase Programs	May 31, 2012 2012 Stock Repurchase Program Maximum	Jun. 30, 2013 Service-based Options	Jun. 30, 2013 Market-based Options item	Jun. 30, 2013 Ordinary performance grants	Jun. 30, 2013 Ordinary performance grants Minimum item	Jun. 30, 2013 Extraordinary performance grants	Jun. 30, 2013 Extraordinary performance grants Minimum item
Stock Repurchase Plan
Number of shares of common stock authorized to be purchased																											3,500,000
Number of shares of common stock purchased																						300,000	0	600,000	300,000	3,100,000
Average purchase price per share (in dollars per share)																						$ 94.49		$ 89.01	$ 63.25	$ 47.04
Remaining number of shares available for repurchase under the plan																						2,900,000		2,900,000		2,900,000
Amount available to repurchase common stock under Luxembourg law (in dollars)																						$ 40,000,000		$ 40,000,000		$ 40,000,000
Senior secured term loan		398,500,000		398,500,000		400,000,000	200,000,000
Capacity available to repurchase common stock under senior secured term loan (in dollars)																						80,000,000		80,000,000		80,000,000
EQUITY AND SHARE-BASED COMPENSATION
Share-based compensation expense (in dollars)		100,000	1,100,000	1,500,000	900,000
Reversal of share-based compensation expense (in dollars)	800,000
Vesting period																												4 years
Expiration term																												10 years
Outstanding (in shares)		2,857,457		2,857,457			3,058,309																					900,000	2,000,000
Number of components of an award																													2
Market-based options subject to specified performance achievement (as a percent)																														0.67		0.33
Percentage of compounded annual gain of stock price over exercise price required for the award to vest																															20.00%		25.00%
Vesting percentage for awards that vest upon achievement of certain criteria																													25.00%
Cumulative vesting percentage for awards that vest in equal annual installments																													75.00%
Number of equal annual installments for vesting of award																													3
Stock options granted (in shares)				45,000	200,000
Weighted average exercise price of stock options granted (in dollars per share)				$ 90.75	$ 63.14
Multiplier of stock price over exercise price as a condition for the award to vest																															2		3
Assumptions used to determine the fair value of options as of the grant date
Risk-free interest rate, minimum (as a percent)										1.02%	0.97%					0.01%	0.08%
Risk-free interest rate, maximum (as a percent)										1.13%	1.17%					2.02%	2.04%
Expected stock price volatility, minimum (as a percent)										36.35%	34.22%					36.40%	34.20%
Expected stock price volatility, maximum (as a percent)										36.76%	34.65%					36.80%	34.60%
Expected option life										6 years 3 months	6 years 3 months
Contractual life																14 years	14 years
Fair value (in dollars per share)				$ 25.83	$ 16.86							$ 31.33	$ 19.25	$ 35.77	$ 22.80			$ 16.12	$ 11.65	$ 31.15	$ 17.27
Weighted-average fair value of stock options granted and total intrinsic value of stock options exercised
Weighted-average fair value at grant date per share (in dollars per share)				$ 25.83	$ 16.86							$ 31.33	$ 19.25	$ 35.77	$ 22.80			$ 16.12	$ 11.65	$ 31.15	$ 17.27
Intrinsic value of options exercised (in dollars)				9,625,000	8,339,000
Fair value of options vested (in dollars)				1,475,000	973,000
Estimated forfeiture rate (as a percent)								1.00%	10.00%
Estimated unrecognized compensation costs (in dollars)		$ 2,700,000		$ 2,700,000
Weighted-average remaining requisite service period for stock options over which unrecognized compensation costs would be recognized				2 years 7 months 6 days