Restructuring and Related Impairment Charges - 2020 restructuring Plan (Details) - 2020 Restructuring Plan - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring and related impairment charges	$ 38,937		$ 340,026
Cash Restructuring Charges
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	175,000		175,000
Facilities and Lease Terminations
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	55,000		55,000
Employee Related Costs
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	25,000		25,000
Contract Termination And Other Restructuring
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	95,000		95,000
Non-Cash Charges
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	350,000		350,000
Long-Lived Asset Impairment
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	290,000		290,000
Intangible and Other Asset Impairment
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	60,000		60,000
Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring and related impairment charges		$ 184,787		$ 524,813
Minimum
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	475,000		475,000
Maximum
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	$ 525,000		$ 525,000