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Financial Instruments and Fair Value , Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | $ 1,634.8 | $ 893.8
Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 565.8 | 185.4
Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 539.5 | 411.5
U.S. government and agency securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 355.1 | 184.9
Certificates of deposit and term deposits |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 169.0 | 112.0
Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 5.4 |
Fair Value [Member] | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets, Fair Value Disclosure | 1,838.4 | 1,060.5
Fair Value [Member] | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets, Fair Value Disclosure | 441.3 | 337.6
Fair Value [Member] | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets, Fair Value Disclosure | 1,397.1 | 722.9
Fair Value [Member] | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets, Fair Value Disclosure | 0.0 | 0.0
Fair Value [Member] | Commercial paper | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 580.3 | 197.2
Fair Value [Member] | Commercial paper | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 0.0 | 0.0
Fair Value [Member] | Commercial paper | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 580.3 | 197.2
Fair Value [Member] | Commercial paper | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 0.0 | 0.0
Fair Value [Member] | Corporate debt securities | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 542.5 | 413.7
Fair Value [Member] | Corporate debt securities | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 0.0 | 0.0
Fair Value [Member] | Corporate debt securities | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 542.5 | 413.7
Fair Value [Member] | Corporate debt securities | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 0.0 | 0.0
Fair Value [Member] | U.S. government and agency securities | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 355.1 | 184.9
Fair Value [Member] | U.S. government and agency securities | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 345.2 | 184.9
Fair Value [Member] | U.S. government and agency securities | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 9.9 | 0.0
Fair Value [Member] | U.S. government and agency securities | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 0.0 | 0.0
Fair Value [Member] | Certificates of deposit and term deposits | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 259.0 | 112.0
Fair Value [Member] | Certificates of deposit and term deposits | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 0.0 | 0.0
Fair Value [Member] | Certificates of deposit and term deposits | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 259.0 | 112.0
Fair Value [Member] | Certificates of deposit and term deposits | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 0.0 | 0.0
Fair Value [Member] | Money market funds | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 57.5 | 152.7
Fair Value [Member] | Money market funds | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 57.5 | 152.7
Fair Value [Member] | Money market funds | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 0.0 | 0.0
Fair Value [Member] | Money market funds | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 0.0 | 0.0
Fair Value [Member] | Municipal bonds | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 5.4 | 0.0
Fair Value [Member] | Municipal bonds | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 0.0 | 0.0
Fair Value [Member] | Municipal bonds | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 5.4 | 0.0
Fair Value [Member] | Municipal bonds | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 0.0 | 0.0
Fair Value [Member] | Marketable equity securities | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 38.6 | 0.0
Fair Value [Member] | Marketable equity securities | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 38.6 | 0.0
Fair Value [Member] | Marketable equity securities | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 0.0 | 0.0
Fair Value [Member] | Marketable equity securities | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 0.0 | 0.0
Reported as [Member] | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets, Fair Value Disclosure | 1,838.4 | 1,060.5
Reported as [Member] | Recurring | Cash equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 165.0 | 166.7
Reported as [Member] | Recurring | Marketable equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 38.6 | 0.0
Reported as [Member] | Recurring | Short-term investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | 1,194.0 | 775.5
Reported as [Member] | Recurring | Long-term investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, Fair Value Disclosure | $ 440.8 | $ 118.3

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