Income Taxes Unrecognized Benefits (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Unrecognized tax benefit - Permanent tax positions	$ 3.0	$ 3.0
Unrecognized tax benefit - Temporary tax positions	4.0	4.0
Total unrecognized tax benefit	7.0	7.0
NOL and tax credit carryforwards	7.0	6.0
Reasonably possible decrease in unrecognized tax benefits	5.0
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	(1.0)	(1.0)	$ 1.0
Unrecognized Tax Benefits, Interest on Income Taxes Expense	0.0	(2.0)
Penalties related to unrecognized tax benefits	$ 0.0	$ 0.0