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Share-Based Compensation - Share-Based Compensation Expense and Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-Based Payment Arrangement [Abstract]
Share-based compensation expense	$ 6.9	$ 8.4	$ 10.0
Tax benefit	0.0	0.0	0.0
Share-based compensation expense, net of tax benefit	6.9	8.4	10.0
Cash received upon the exercise of stock options	0.0	0.0	0.0
Write-off tax benefits related to share-based compensation	$ 0.0	$ 0.0	$ 0.0

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- Definition

Share Based Compensation Expense Net of Tax.

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Write-Off Tax Benefits Related To Share-Based Compensation

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-14

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-Name Accounting Standards Codification
-Section 50
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-Subparagraph (a)
-SubTopic 10
-Topic 718
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Amount of noncash expense for share-based payment arrangement.

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-Paragraph 28
-Subparagraph (a)
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