Income Taxes - Net Operating Losses (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
2020-2024	$ 7.7
2025-2029	4.4
2030 and thereafter	16.2
Unlimited	23.4
Tax benefit of net operating loss carryforwards before valuation allowances	51.7	$ 42.0
Federal
Operating Loss Carryforwards [Line Items]
2020-2024	0.0
2025-2029	0.0
2030 and thereafter	0.0
Unlimited	0.0
Tax benefit of net operating loss carryforwards before valuation allowances	0.0
State
Operating Loss Carryforwards [Line Items]
2020-2024	0.1
2025-2029	0.7
2030 and thereafter	15.6
Unlimited	0.0
Tax benefit of net operating loss carryforwards before valuation allowances	16.4
Foreign
Operating Loss Carryforwards [Line Items]
2020-2024	7.6
2025-2029	3.7
2030 and thereafter	0.6
Unlimited	23.4
Tax benefit of net operating loss carryforwards before valuation allowances	$ 35.3