Debt - Summary of Debt (Parenthetical) (Details) - Senior Notes	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Sep. 25, 2014	Mar. 19, 2013
6.00% Senior Notes due 2026
Line Of Credit Facility [Line Items]
Stated interest rate	6.00%	6.00%
Debt instrument maturity year	2026	2026
5.875% Senior Notes due 2024
Line Of Credit Facility [Line Items]
Stated interest rate	5.875%	5.875%	5.875%
Debt instrument maturity year	2024	2024
5.125% Senior Notes due 2023
Line Of Credit Facility [Line Items]
Stated interest rate	5.125%	5.125%		5.125%
Debt instrument maturity year	2023	2023
5.875% Senior Notes due 2022
Line Of Credit Facility [Line Items]
Stated interest rate	5.875%	5.875%
Debt instrument maturity year	2022	2022