Debt - Debentures (Parenthetical) (Details) - Unsecured Debt	3 Months Ended	12 Months Ended
Mar. 31, 2022	Dec. 31, 2021
7.950% Debentures due 2025
Debt Instrument [Line Items]
Interest rate	7.95%	7.95%
Debt instrument maturity year	2025	2025
8.375% Debentures due 2027
Debt Instrument [Line Items]
Interest rate	8.375%	8.375%
Debt instrument maturity year	2027	2027

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: 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

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant