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Debt - Estimated Fair Values of Long-term Debt (Details) - Senior Notes - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
6.875% senior secured notes due November 1, 2027
Debt Instrument [Line Items]
Stated interest rate (as a percentage)	6.875%
5.50% convertible senior notes due March 1, 2021
Debt Instrument [Line Items]
Stated interest rate (as a percentage)		5.50%
Estimated Fair Value | 6.875% senior secured notes due November 1, 2027
Debt Instrument [Line Items]
Long-term debt	$ 527.0	$ 532.3
Estimated Fair Value | 5.50% convertible senior notes due March 1, 2021
Debt Instrument [Line Items]
Long-term debt	$ 0.0	$ 169.8

X

- Definition

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

+ References

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 https://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 https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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