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COMMON STOCK REPURCHASE PROGRAM	12 Months Ended
COMMON STOCK REPURCHASE PROGRAM	Dec. 31, 2018
COMMON SHARE REPURCHASE PROGRAM
COMMON STOCK REPURCHASE PROGRAM	COMMON STOCK REPURCHASE PROGRAM The Company has a share repurchase program for up to 55 million of the Company's common shares. At management's discretion, the Company repurchases its common shares from time to time in the open market, depending on market conditions, stock price and other factors. During the year ended December 31, 2018, the Company purchased a total of 2.3 million shares at an average cost per share of $88.84. As of December 31, 2018, 6.2 million shares remained available for repurchase under the stock repurchase program. The treasury shares have not been retired.