CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)	Dec. 31, 2020	Apr. 29, 2020	Dec. 31, 2019	Dec. 06, 2010
3.00% Senior Notes, due May 2030
Stated interest rate	3.00%
4.5% Senior Notes, due December 2020
Stated interest rate			4.50%	4.50%
Senior Notes | 3.00% Senior Notes, due May 2030
Stated interest rate	3.00%	3.00%
Senior Notes | 4.5% Senior Notes, due December 2020
Stated interest rate	4.50%