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Investments - Equity Securities and Other Long-Term Investments (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Other long-term investments, Cost or amortized cost	$ 437.9	$ 438.2
Other long-term investments, Gross unrealized gains	32.3	37.5
Other long-term investments, Gross unrealized losses	(154.8)	(162.7)
Other long-term investments, net foreign currency gains	2.3	3.5
Other long-term investments, Fair value	$ 317.7	$ 316.5

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Other Long-Term Investments, Accumulated Net Foreign Currency Gains (Losses)

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Other Long-Term Investments, Accumulated Unrecognized Gain

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Other Long-Term Investments, Accumulated Unrecognized Loss

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- Definition

Other Long-Term Investments, Cost

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Amount of long-term investments classified as other.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(f))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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