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Cash, Cash Equivalents, and Marketable Debt Securities - Schedule of Company's Cash and Available-For-Sale (AFS) Debt Securities by Major Asset Category (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Financial Instruments [Line Items] |  |  |  |
Adjusted Cost Basis |  | $ 472.7 |  | $ 765.2
Unrealized Gain |  | 0.0 |  | 0.0
Unrealized Loss |  | (2.6) |  | (0.4)
Fair Value |  | 470.1 |  | 764.8
Cash and cash equivalents |  | 320.0 |  | 618.7
Short-term marketable debt securities |  | 85.2 |  | 86.1
Long-term marketable debt securities |  | 64.9 |  | 60.0
Level 1 |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Adjusted Cost Basis | [1] | 24.4 |  | 27.3
Unrealized Gain | [1] | 0.0 | [2] | 0.0
Unrealized Loss | [1] | (0.4) |  | (0.1)
Fair Value | [1] | 24.0 |  | 27.2
Cash and cash equivalents | [1] | 0.1 |  | 2.9
Short-term marketable debt securities | [1] | 16.7 |  | 14.7
Long-term marketable debt securities | [1] | 7.2 |  | 9.6
Level 2 |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Adjusted Cost Basis | [2] | 130.0 |  | 125.6
Unrealized Gain | [2] |  |  | 0.0
Unrealized Loss | [2] | 2.2 |  | (0.3)
Fair Value | [2] | 127.8 |  | 125.3
Cash and cash equivalents | [2] | 1.6 |  | 3.5
Short-term marketable debt securities | [2] | 68.5 |  | 71.4
Long-term marketable debt securities | [2] | 57.7 |  | 50.4
U.S. Government Agency Securities | Level 2 |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Adjusted Cost Basis | [2] | 4.5 |  | 4.8
Unrealized Gain | [2] | 0.0 |  | 0.0
Unrealized Loss | [2] | (0.1) |  | 0.0
Fair Value | [2] | 4.4 |  | 4.8
Cash and cash equivalents | [2] | 0.0 |  | 0.0
Short-term marketable debt securities | [2] | 1.2 |  | 3.5
Long-term marketable debt securities | [2] | 3.2 |  | 1.3
Corporate Debt Securities | Level 2 |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Adjusted Cost Basis | [2] | 123.9 |  | 118.9
Unrealized Gain | [2] | 0.0 |  | 0.0
Unrealized Loss | [2] | 2.1 |  | (0.3)
Fair Value | [2] | 121.8 |  | 118.6
Cash and cash equivalents | [2] | 1.6 |  | 3.5
Short-term marketable debt securities | [2] | 65.7 |  | 66.0
Long-term marketable debt securities | [2] | 54.5 |  | 49.1
Cash and Cash Equivalents |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Adjusted Cost Basis |  | 318.3 |  | 612.3
Unrealized Gain |  | 0.0 |  | 0.0
Unrealized Loss |  | 0.0 |  |
Fair Value |  | 318.3 |  | 612.3
Cash and cash equivalents |  | 318.3 |  | 612.3
Short-term marketable debt securities |  | 0.0 |  | 0.0
Long-term marketable debt securities |  | 0.0 |  | 0.0
Money Market Fund | Level 1 |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Adjusted Cost Basis | [1] | 0.1 |  | 0.9
Unrealized Gain | [1] | 0.0 |  | 0.0
Unrealized Loss | [1] | 0.0 |  | 0.0
Fair Value | [1] | 0.1 |  | 0.9
Cash and cash equivalents | [1] | 0.1 |  | 0.9
Short-term marketable debt securities | [1] | 0.0 |  | 0.0
Long-term marketable debt securities | [1] | 0.0 |  | 0.0
U.S. Treasury Securities | Level 1 |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Adjusted Cost Basis | [1] | 24.3 |  | 26.4
Unrealized Gain | [1] | 0.0 |  | 0.0
Unrealized Loss | [1] | 0.4 |  | (0.1)
Fair Value | [1] | 23.9 |  | 26.3
Cash and cash equivalents | [1] | 0.0 |  | 2.0
Short-term marketable debt securities | [1] | 16.7 |  | 14.7
Long-term marketable debt securities | [1] | 7.2 |  | 9.6
Certificates of Deposit | Level 2 |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Adjusted Cost Basis | [2] | 1.6 |  | 1.9
Unrealized Gain | [2] | 0.0 |  | 0.0
Unrealized Loss | [2] | 0.0 |  |
Fair Value | [2] | 1.6 |  | 1.9
Cash and cash equivalents | [2] | 0.0 |  | 0.0
Short-term marketable debt securities | [2] | 1.6 |  | 1.9
Long-term marketable debt securities | [2] | $ 0.0 |  | $ 0.0
[1] | Valuations based on quoted prices for identical assets and liabilities in active markets.
[2] | Valuations based on observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3044-108585 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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