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Investments in Unconsolidated Affiliates - Summary of Investments in Unconsolidated Affiliates Not Accounted for Under Equity Method Without a Readily Determinable Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2021
Equity Investments With Readily Determinable Fair Value
Schedule Of Equity Method Investments [Line Items]
Cost Basis	$ 25.0	$ 25.0	$ 25.0
Unrealized Gain (Loss)	(21.2)	(10.8)	(4.4)
Fair Value	3.8	14.2	20.6
Equity Investments Without Readily Determinable Fair Value
Schedule Of Equity Method Investments [Line Items]
Cost Basis	4.2	1.7	1.7
Accumulated Impairment and Adjustments	(0.2)
Carrying Value	$ 4.0	$ 1.7	$ 1.7

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Equity method of investment unrealized gain (loss).

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This element represents the aggregate cost of investments accounted for under the equity method of accounting.

+ 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
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Fair value portion of investments accounted under the equity method.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 25
-Paragraph 2
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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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Amount of investment in equity security without readily determinable fair value.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
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Amount of cumulative impairment loss on investment in equity security without readily determinable fair value.

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