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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
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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