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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Marketable securities | $ 148.6 |
Recurring basis | Carrying Value |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Cash and cash equivalents | 416.1 | $ 716.8
Marketable securities | 148.6 | 50.0
Deferred consideration | 10.8 | 14.9
Contingent consideration liabilities | 55.6 | 75.7
Recurring basis | Fair Value | Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Cash and cash equivalents | 416.1 | 716.8
Marketable securities | 148.6 | 50.0
Deferred consideration | 0.0 | 0.0
Contingent consideration liabilities | 0.0 | 0.0
Recurring basis | Fair Value | Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Cash and cash equivalents | 0.0 | 0.0
Marketable securities | 0.0 | 0.0
Deferred consideration | 10.8 | 14.9
Contingent consideration liabilities | 0.0 | 0.0
Recurring basis | Fair Value | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Cash and cash equivalents | 0.0 | 0.0
Marketable securities | 0.0 | 0.0
Deferred consideration | 0.0 | 0.0
Contingent consideration liabilities | $ 55.6 | $ 75.7

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