Income Taxes - Net Operating Losses (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
2021-2025	$ 10.6
2026-2030	3.3
2031 and thereafter	16.8
Unlimited	44.1
Tax benefit of net operating loss carryforwards before valuation allowances	74.8	$ 51.7
Federal
Operating Loss Carryforwards [Line Items]
2021-2025	0.0
2026-2030	0.0
2031 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]
2021-2025	0.0
2026-2030	0.8
2031 and thereafter	14.1
Unlimited	0.7
Tax benefit of net operating loss carryforwards before valuation allowances	15.6
Foreign
Operating Loss Carryforwards [Line Items]
2021-2025	10.6
2026-2030	2.5
2031 and thereafter	2.7
Unlimited	43.4
Tax benefit of net operating loss carryforwards before valuation allowances	$ 59.2