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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related future consideration liabilities	$ 11.9
Acquisition-related future consideration liabilities recorded in other current liabilities	7.5
Acquisition-related future consideration liabilities recorded in other long-term liabilities	4.4
Money market
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	161.9	$ 244.3
Mutual Fund | NAV
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other financial assets	$ 17.2	$ 6.9

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