Prepaid Expenses and Other Current Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Commissions
Capitalized Contract Cost [Line Items]
Amortization expense related to deferred commissions	$ 44.3	$ 45.0	$ 37.6