SHARE-BASED COMPENSATION PLANS - Restricted Stock Awards, Activity (Details) - Restricted Stock shares in Thousands	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Time-Vested
Shares
Unvested stock outstanding at January 1 (in shares) | shares	730
Granted (in shares) | shares	752
Vested (in shares) | shares	(243)
Forfeited (in shares) | shares	(44)
Unvested stock outstanding at December 31 (in shares) | shares	1,195
Weighted- Average Grant Date Fair Value
Nonvested stock outstanding at January 1 (in dollars per share) | $ / shares	$ 63.21
Granted (in dollars per share) | $ / shares	39.39
Vested (in dollars per share) | $ / shares	64.43
Forfeited (in dollars per share) | $ / shares	47.78
Nonvested stock outstanding at December 31 (in dollars per share) | $ / shares	$ 48.53
Performance-Based
Shares
Unvested stock outstanding at January 1 (in shares) | shares	374
Granted (in shares) | shares	288
Vested (in shares) | shares	(60)
Forfeited (in shares) | shares	(74)
Unvested stock outstanding at December 31 (in shares) | shares	528
Weighted- Average Grant Date Fair Value
Nonvested stock outstanding at January 1 (in dollars per share) | $ / shares	$ 67.14
Granted (in dollars per share) | $ / shares	36.35
Vested (in dollars per share) | $ / shares	80.43
Forfeited (in dollars per share) | $ / shares	56.70
Nonvested stock outstanding at December 31 (in dollars per share) | $ / shares	$ 32.03