Income Taxes - Operating Loss Carryforwards (Details) $ in Millions	Dec. 31, 2019 USD ($)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 31.8
Tax credit carryforwards	37.2
United States
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	220.9
International
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	110.0
2024
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0.0
2025
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0.0
2026
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0.0
2027
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0.0
2028
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	31.8
2029
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 0.0