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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Acquisition-related future consideration liabilities | $ 11.8 |
Acquisition-related future consideration liabilities recorded in other current liabilities | 7.2 |
Acquisition-related future consideration liabilities recorded in other long-term liabilities | 4.6 |
Investments—Consolidated Investment Companies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets net | 0.3 |
Forward Contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 30.4 |
Derivative liability | 30.1 |
Money market |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 207.1 | $ 244.3
Mutual Fund | NAV |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other financial assets | $ 15.4 | $ 6.9

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