STOCK-BASED COMPENSATION (Summary Of The Company's Option Activity) (Details) - Employee Stock Option $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
Options
Outstanding (in shares) | shares	3,060,242
Granted (in shares) | shares	0
Exercised (in shares) | shares	(1,043,981)
Forfeited (in shares) | shares	0
Expired (in shares) | shares	0
Outstanding (in shares) | shares	2,016,261
Exercisable (in shares) | shares	2,014,628
Vested or expected to vest (in shares) | shares	2,016,261
Weighted Average Exercise Price Per Share
Outstanding (in dollars per share) | $ / shares	$ 85.90
Granted (in dollars per share) | $ / shares	0
Exercised (in dollars per share) | $ / shares	81.16
Forfeited (in dollars per share) | $ / shares	0
Expired (in dollars per share) | $ / shares	0
Outstanding (in dollars per share) | $ / shares	88.36
Exercisable (in dollars per share) | $ / shares	88.33
Vested or expected to vest (in dollars per share) | $ / shares	$ 88.36
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining life, outstanding	3 years 1 month 24 days
Weighted average remaining life, exercisable	3 years 1 month 24 days
Weighted average remaining life, vested or expected to vest	3 years 1 month 24 days
Aggregate intrinsic value, outstanding | $	$ 274.4
Aggregate intrinsic value, exercisable | $	274.2
Aggregate intrinsic value, vested or expected to vest | $	$ 274.4