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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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Amount of liability recognized from contingent consideration in asset acquisition.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 50
-Name Accounting Standards Codification
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+ References

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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