CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Assets [Abstract]
Property, plant and equipment, accumulated depreciation	$ 6,639,771	$ 6,431,843
Amortizable intangible assets, accumulated amortization	$ 4,574,426	4,409,312
Accounts receivable, trade allowance for doubtful accounts		$ 25,198
Stockholders' Deficiency:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Treasury Stock, Shares, Acquired	6,066,251	6,629,415
Common stock, shares outstanding (in shares)	461,977,407
Common Class A
Stockholders' Deficiency:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	4,000,000,000	4,000,000,000
Common stock, shares issued (in shares)	282,245,265	297,203,087
Common stock, shares outstanding (in shares)	276,179,014	290,573,672
Common Class B
Stockholders' Deficiency:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares outstanding (in shares)	185,798,393	185,895,903
Common Class C
Stockholders' Deficiency:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	4,000,000,000	4,000,000,000
Common stock, shares issued (in shares)	0	0
Common stock, shares outstanding (in shares)	0	0