Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related future consideration liabilities	$ 11.6
Acquisition-related future consideration liabilities recorded in Other Current liabilities	7.3
Acquisition-related future consideration liabilities recorded in Other Long-Term liabilities	4.3
Money Market
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	252.2	$ 222.1
Mutual Fund | NAV
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other financial assets	$ 5.2	$ 3.7