Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Valuation allowance, change in amount	$ (136.9)	$ (2.5)	$ 8.4
Unrecognized tax benefits that would impact effective tax rate	27.1
Research Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	0.6
Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	31.5
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	119.1
State and Local Jurisdiction | California and New Jersey Research Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	22.9
Non-US
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	713.8
Non-US | Capital Loss Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	$ 14.6