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Financial Instruments − Fair Value and Concentrations of Credit Risk - Financial Instruments Measured at Fair Value and Related Hierarchy Levels (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Investment securities, current: |  |
Debt securities, current | $ 3,322.5 | $ 3,022.1
Investment securities, non-current: |  |
Fair value | 65.7 | 66.8
Executive deferred compensation plan trust | 15.6 | 13.7
Prepaid expenses and other current assets |  |
Investment securities, non-current: |  |
Executive deferred compensation plan trust | 1.4 | 1.7
Other assets |  |
Investment securities, non-current: |  |
Executive deferred compensation plan trust | 14.2 | 12.0
Accrued expenses and other current liabilities |  |
Liabilities |  |
Contingent consideration | 64.8 | 64.5
Other liabilities |  |
Liabilities |  |
Contingent consideration | 60.3 | 121.7
Debt securities |  |
Investment securities, non-current: |  |
Debt securities | 27.4 | 28.4
Municipal bonds |  |
Investment securities, current: |  |
Debt securities, current | 65.4 | 65.7
Asset-backed securities |  |
Investment securities, current: |  |
Debt securities, current | 671.2 | 581.6
Mortgage-backed securities |  |
Investment securities, current: |  |
Debt securities, current | 993.2 | 927.4
Mutual fund |  |
Investment securities, non-current: |  |
Equity securities, FV-NI, noncurrent | 25.4 | 25.5
Pooled investment fund measured at NAV |  |
Investment securities, non-current: |  |
Equity securities, FV-NI, noncurrent | 12.9 | 12.9
Level 1 |  |
Investment securities, non-current: |  |
Executive deferred compensation plan trust | 15.6 | 13.7
Level 1 | Money market funds |  |
Assets: |  |
Money market funds | 44.1 | 25.5
Level 1 | Mutual fund |  |
Investment securities, non-current: |  |
Equity securities, FV-NI, noncurrent | 25.4 | 25.5
Level 2 | US Treasury Bill Securities |  |
Assets: |  |
Money market funds | 0.0 | 10.4
Level 2 | Debt securities |  |
Investment securities, non-current: |  |
Debt securities | 27.4 | 28.4
Level 2 | U.S. treasury notes |  |
Investment securities, current: |  |
Debt securities, current | 395.1 | 378.6
Level 2 | Corporate debt securities |  |
Investment securities, current: |  |
Debt securities, current | 1,197.6 | 1,068.8
Level 2 | Municipal bonds |  |
Investment securities, current: |  |
Debt securities, current | 65.4 | 65.7
Level 2 | Asset-backed securities |  |
Investment securities, current: |  |
Debt securities, current | 671.2 | 581.6
Level 2 | Mortgage-backed securities |  |
Investment securities, current: |  |
Debt securities, current | 993.2 | 927.4
Net Asset Value | Pooled investment fund measured at NAV |  |
Investment securities, non-current: |  |
Equity securities, FV-NI, noncurrent | 12.9 | 12.9
Level 3 | Contingent consideration |  |
Liabilities |  |
Contingent consideration | $ 125.1 | $ 186.2

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