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Financial Instruments - Summary of financial assets with maturities of less than 90 days included within cash and cash equivalents (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Net Investment Income [Line Items] |  |
Cash equivalents, at carrying value | $ 2,234.9 | $ 1,664.9
Money market funds |  |
Net Investment Income [Line Items] |  |
Cash equivalents, at carrying value | $ 2,234.9 | $ 1,664.9

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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -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(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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