SHARE-BASED COMPENSATION (Details 3) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Time-Based RSUs
Time-Based RSUs, Performance-Based RSUs and Deferred Share Units
Stock-Based Awards at the beginning of the period (in shares)	900,000
Granted (in shares)	100,000
Vested (in shares)	(100,000)
Stock-Based Awards at the end of the period (in shares)	900,000	900,000
Weighted-average grant-date fair value
Stock-Based awards at the beginning of the period (in dollars per share)	$ 39.11
Granted (in dollars per share)	$ 137.71
Vested (in dollars per share)	$ 54.60
Stock-Based awards at the end of the period (in dollars per share)	$ 51.34	$ 39.11
Unrecognized compensation expense
Remaining unrecognized compensation expense related to non-vested awards	$ 18.5
Weighted-average remaining requisite service period over which unrecognized compensation cost is expected to be amortized	2 years 9 months 18 days
Total fair value	8.1	15.2	18.0
Performance-Based Restricted Stock Units
Time-Based RSUs, Performance-Based RSUs and Deferred Share Units
Stock-Based Awards at the beginning of the period (in shares)	1,000,000
Granted (in shares)	500,000
Vested (in shares)	(200,000)
Forfeited (in shares)	(100,000)
Stock-Based Awards at the end of the period (in shares)	1,200,000	1,000,000
Weighted-average grant-date fair value
Stock-Based awards at the beginning of the period (in dollars per share)	$ 102.22
Granted (in dollars per share)	$ 219.79
Vested (in dollars per share)	$ 61.80
Forfeited (in dollars per share)	$ 136.59
Stock-Based awards at the end of the period (in dollars per share)	$ 160.44	$ 102.22
Unrecognized compensation expense
Remaining unrecognized compensation expense related to non-vested awards	$ 128.9
Weighted-average remaining requisite service period over which unrecognized compensation cost is expected to be amortized	3 years 1 month
Method and assumptions on valuation of stock options
Expected Company share volatility, minimum (as a percent)	38.70%	36.10%	42.50%
Expected Company share volatility, maximum (as a percent)	45.40%	44.40%	52.30%
Risk-free interest rate, minimum (as a percent)	0.80%	0.50%	0.60%
Risk-free interest rate, maximum (as a percent)	2.30%	1.30%	1.00%
Maximum number of shares that can be issued upon vesting of performance-based RSUs outstanding	3,065,374
Performance-Based Restricted Stock Units | Minimum
Method and assumptions on valuation of stock options
Contractual term (years)	2 years 7 months 6 days	2 years 9 months 18 days	2 years 10 months 24 days
Performance-Based Restricted Stock Units | Maximum
Method and assumptions on valuation of stock options
Contractual term (years)	6 years 3 months 18 days	4 years 3 months 18 days	4 years 3 months 18 days