SHARE-BASED COMPENSATION (Details 3) (USD $)	12 Months Ended																													0 Months Ended	4 Months Ended	7 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Restructuring and other costs	Dec. 31, 2010 Restructuring and other costs	Dec. 31, 2012 Stock options	Dec. 31, 2011 Stock options	Dec. 31, 2010 Stock options	Dec. 31, 2012 Stock options Exercise price, range one	Dec. 31, 2012 Stock options Exercise price, range two	Dec. 31, 2012 Stock options Exercise price, range three	Dec. 31, 2012 Stock options Exercise price, range four	Dec. 31, 2012 Stock options Exercise price, range five	Dec. 31, 2012 Stock options Exercise price, range six	Dec. 31, 2012 RSUs	Dec. 31, 2011 RSUs	Dec. 31, 2010 RSUs	Dec. 31, 2012 Time-Based RSUs	Dec. 31, 2011 Time-Based RSUs	Dec. 31, 2010 Time-Based RSUs	Dec. 31, 2012 Performance-Based Restricted Stock Units	Dec. 31, 2010 Performance-Based Restricted Stock Units Prior to merger	Dec. 31, 2012 Performance-Based Restricted Stock Units After merger	Dec. 31, 2011 Performance-Based Restricted Stock Units After merger	Dec. 31, 2010 Performance-Based Restricted Stock Units After merger	Dec. 31, 2012 Performance-Based Restricted Stock Units After merger Maximum	Dec. 31, 2010 Performance-Based Restricted Stock Units After merger Maximum	Dec. 31, 2012 Performance-Based Restricted Stock Units After merger Minimum	Dec. 31, 2010 Performance-Based Restricted Stock Units After merger Minimum	May 16, 2011 Deferred Share Units ("DSU")	May 16, 2011 Deferred Share Units ("DSU")	Dec. 31, 2012 Deferred Share Units ("DSU")	Dec. 31, 2012 Deferred Share Units ("DSU")	Dec. 31, 2010 Deferred Share Units ("DSU")	Feb. 28, 2013 Deferred Share Units ("DSU") Subsequent event	Dec. 31, 2012 Deferred Share Units ("DSU") Maximum	May 16, 2011 Deferred Share Units ("DSU") Maximum	Dec. 31, 2012 Deferred Share Units ("DSU") Minimum	Dec. 31, 2011 Deferred Share Units ("DSU") Restructuring and other costs
Unrecognized compensation expense
Remaining unrecognized compensation expense related to non-vested awards						$ 38,100,000												$ 15,600,000			$ 40,300,000
Weighted-average remaining requisite service period over which unrecognized compensation cost is expected to be amortized						2 years 6 months												1 year 8 months 12 days			2 years 3 months 18 days
Total fair value of stock options vested during the period						36,100,000	35,400,000	39,100,000
Total fair value																		18,000,000	16,200,000	11,600,000
Maximum number of common shares that could be issued upon vesting of outstanding awards																					3,602,281
Options Outstanding and Exercisable
Exercise price range, lower range limit (in dollars per share)									$ 3.46	$ 5.33	$ 8.03	$ 12.87	$ 20.42	$ 39.95
Exercise price range, upper range limit (in dollars per share)									$ 5.19	$ 8.00	$ 12.05	$ 19.31	$ 30.63	$ 54.76
Outstanding						8,506,000			3,097,000	367,000	40,000	2,382,000	760,000	1,860,000
Weighted-Average Remaining Contractual Life						6 years			5 years	4 years 9 months 18 days	3 years 1 month 6 days	7 years	3 years 1 month 6 days	7 years 8 months 12 days
Weighted-Average Exercise Price (in dollars per share)						$ 18.97			$ 4.22	$ 6.39	$ 9.47	$ 13.04	$ 25.17	$ 51.26
Exercisable (in shares)						4,491,000			3,097,000	270,000	35,000	586,000	269,000	234,000
Weighted-Average Exercise Price (in dollars per share)						$ 9.23			$ 4.22	$ 5.97	$ 9.52	$ 13.04	$ 25.39	$ 51.14
Time-Based RSUs, Performance-Based RSUs and Deferred Share Units
Stock-Based Awards at the beginning of the period (in shares)																		1,829,000			2,060,000												148,000
Granted (in shares)																		222,000			334,000
Vested (in shares)																		(646,000)			(603,000)
Forfeited (in shares)																		(95,000)			(95,000)
Settled for cash (in shares)																																		(84,888)
Stock-Based Awards at the end of the period (in shares)																		1,310,000	1,829,000		1,696,000											148,000	148,000
Weighted-average grant-date fair value
Stock-Based awards at the beginning of the period (in dollars per share)																		$ 29.47			$ 31.24												$ 16.78
Granted (in dollars per share)																		$ 50.44			$ 81.55
Vested (in dollars per share)																		$ 28.00			$ 47.91
Forfeited (in dollars per share)																		$ 33.84			$ 27.21
Stock-Based awards at the end of the period (in dollars per share)																		$ 33.43	$ 29.47		$ 43.40											$ 16.78	$ 16.78
Method and assumptions on valuation of stock options
Contractual term						4 years	4 years	4 years														5 years		3 years		4 years 3 months 18 days	4 years 7 months 6 days	2 years 10 months 24 days	4 years 1 month 6 days
Expected company share volatility (as a percent)						44.90%	42.80%	37.10%														43.20%
Average comparator group share price volatility (as a percent)																						34.70%
Risk-free interest rate (as a percent)						0.50%	1.40%	1.50%														2.40%
Expected dividend yield (as a percent)								1.50%
Expected Company share volatility, minimum (as a percent)																							42.50%	34.60%	32.40%
Expected Company share volatility, maximum (as a percent)																							52.30%	60.80%	33.20%
Risk-free interest rate, minimum (as a percent)																							0.60%	1.00%	1.20%
Risk-free interest rate, maximum (as a percent)																							1.00%	1.90%	2.30%
Liabilities, DSU plan
Number of days average trading price as base for determining amount of deferred compensation	5 days
Number of days average trading price as base for determining amount of deferred compensation for directors subject to taxation																																				5 days		1 day
Value of DSUs remaining to be settled																																6,200,000	6,200,000
Liabilities reclassified from accrued liabilities to additional paid-in capital																																					9,300,000
Shares held by current directors from accrued liabilities to additional paid-in capital (in shares)																														182,053
Number of shares held by former directors were not affected by the modification and continue to be cash settled																																	17,219	218,123
Stock-based compensation expense	66,236,000	94,023,000	98,033,000	985,000	49,482,000	21,739,000	45,465,000	56,851,000							44,497,000	48,558,000	41,182,000														3,600,000			8,500,000					800,000
Payment of deferred compensation obligation, net																																	$ 2,300,000
RSUs
Vesting period															3 years																	1 year
Number of shares redeemed for cash																																			17,219