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Cash, Cash Equivalents and Short-Term Investments - Schedule of Amortized Cost, Unrealized Gains and Losses and Estimated Fair Value of Cash, Cash Equivalents and Short-Term Investments (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | --- | ---
Cash and Cash Equivalents [Line Items] |  |  |
Cash and cash equivalents, amortized cost | $ 942.2 | $ 1,328.3 | $ 548.9
Cash and cash equivalents, estimated fair value | 942.2 | 1,328.3 |
Short-term investments, amortized cost | 242.7 | 272.9 |
Short-term investments, unrealized gain | 0.2 | 0.2 |
Short-term investments, unrealized loss | (5.1) | (7.2) |
Short-term investments, estimated fair value | 237.8 | 265.9 |
Total cash, cash equivalents, and short term investments, before unrealized gains (losses) on investments | 1,184.9 | 1,601.2 |
Total cash, cash equivalents, and short term investments | 1,180.0 | 1,594.2 |
Corporate notes and obligations |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Short-term investments, amortized cost | 114.9 | 133.1 |
Short-term investments, unrealized gain | 0.2 | 0.2 |
Short-term investments, unrealized loss | (2.4) | (3.3) |
Short-term investments, estimated fair value | 112.7 | 130.0 |
U.S. Treasury securities |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Short-term investments, amortized cost | 85.1 | 85.0 |
Short-term investments, unrealized gain | 0.0 | 0.0 |
Short-term investments, unrealized loss | (1.8) | (2.6) |
Short-term investments, estimated fair value | 83.3 | 82.4 |
Municipal securities |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Short-term investments, amortized cost | 24.5 | 30.0 |
Short-term investments, unrealized gain | 0.0 | 0.0 |
Short-term investments, unrealized loss | (0.5) | (0.7) |
Short-term investments, estimated fair value | 24.0 | 29.3 |
Asset backed securities |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Short-term investments, amortized cost | 12.6 | 19.2 |
Short-term investments, unrealized gain | 0.0 | 0.0 |
Short-term investments, unrealized loss | (0.2) | (0.3) |
Short-term investments, estimated fair value | 12.4 | 18.9 |
U.S. agency obligations |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Short-term investments, amortized cost | 3.8 | 3.8 |
Short-term investments, unrealized gain | 0.0 | 0.0 |
Short-term investments, unrealized loss | (0.1) | (0.2) |
Short-term investments, estimated fair value | 3.7 | 3.6 |
Supranational securities |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Short-term investments, amortized cost | 1.8 | 1.8 |
Short-term investments, unrealized gain | 0.0 | 0.0 |
Short-term investments, unrealized loss | (0.1) | (0.1) |
Short-term investments, estimated fair value | 1.7 | 1.7 |
Cash |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Cash and cash equivalents, amortized cost | 89.5 | 98.3 |
Cash and cash equivalents, estimated fair value | 89.5 | 98.3 |
Money market funds |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Cash and cash equivalents, amortized cost | 852.7 | 1,230.0 |
Cash and cash equivalents, estimated fair value | $ 852.7 | $ 1,230.0 |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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/2003/role/disclosureRef -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 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(9)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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