Income Taxes - Details of Scheduled Expiration Dates of Tax Effected Net Operating Loss (NOL) and Other Tax Carryforwards (Details) $ in Millions	Dec. 31, 2019 USD ($)
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Total	$ 34.0
U.S. federal
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Net Operating Loss	29.0
U.S. federal tax credit carryforwards	0.1
State taxing jurisdiction
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Net Operating Loss	1.8
U.S. federal and non-U.S.
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
U.S. federal and non-U.S. capital loss carryforwards	3.1
2020 Through 2029
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Total	33.7
2020 Through 2029 | U.S. federal
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Net Operating Loss	29.0
U.S. federal tax credit carryforwards	0.1
2020 Through 2029 | State taxing jurisdiction
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Net Operating Loss	1.6
2020 Through 2029 | U.S. federal and non-U.S.
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
U.S. federal and non-U.S. capital loss carryforwards	3.0
2030 Through 2039
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Total	0.2
2030 Through 2039 | State taxing jurisdiction
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Net Operating Loss	0.2
Indefinite
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
Total	0.1
Indefinite | U.S. federal and non-U.S.
Operating Loss Carryforwards And Other Tax Carryforwards [Line Items]
U.S. federal and non-U.S. capital loss carryforwards	$ 0.1