Supplemental Financial Information Narrative (Details)	Sep. 30, 2020	Apr. 07, 2020	Nov. 19, 2019	Sep. 24, 2019	Aug. 28, 2017	May 17, 2017
2020 5.75% Senior Notes (due April 15,2025)
Stated interest rate (as a percent)	5.75%	5.75%
2019 4.375% Senior Notes (due January 15, 2028)
Stated interest rate (as a percent)	4.375%		4.375%
2019 3.875% Senior Notes (due January 15, 2028)
Stated interest rate (as a percent)	3.875%			3.875%
2017 5.00% Senior Notes (due October 15, 2025)
Stated interest rate (as a percent)	5.00%				5.00%
2017 4.25% Senior Notes (due May 15, 2024)
Stated interest rate (as a percent)	4.25%					4.25%