Debt - Covenants and Compliance (Details) - Senior Notes	Sep. 30, 2020
Indenture Excess Leverage Ratio \| Minimum
Debt Instrument
Ratio of Indebtedness to Net Capital	0.35
Indenture Excess Leverage Ratio \| Maximum
Debt Instrument
Ratio of Indebtedness to Net Capital	1.00
6.75% Notes
Debt Instrument
Interest rate on debt	6.75%
7.625% Notes
Debt Instrument
Interest rate on debt	7.625%

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

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=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant