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Debt (Parenthetical) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Feb. 25, 2021	Feb. 24, 2021	Mar. 31, 2020
6.50% Exchangeable Senior Notes due 2026
Line Of Credit Facility [Line Items]
Stated interest rate	6.50%
6.00% Senior Notes due 2026
Line Of Credit Facility [Line Items]
Stated interest rate	6.00%	6.00%
5.875% Senior Notes due 2024
Line Of Credit Facility [Line Items]
Stated interest rate	5.875%	5.875%
5.125% Senior Notes due 2023
Line Of Credit Facility [Line Items]
Stated interest rate	5.125%	5.125%
5.875% Senior Notes due 2022
Line Of Credit Facility [Line Items]
Stated interest rate	5.875%	5.875%
Convertible Debt | 6.50% Exchangeable Senior Notes due 2026
Line Of Credit Facility [Line Items]
Stated interest rate	6.50%	6.50%	6.50%	6.50%
Debt instrument maturity year	2026	2026
Senior Notes | 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
Senior Notes | 5.875% Senior Notes due 2024
Line Of Credit Facility [Line Items]
Stated interest rate	5.875%	5.875%
Debt instrument maturity year	2024	2024
Senior Notes | 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
Senior Notes | 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

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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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