Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Deferred tax expense related to discontinued operations	$ 0.0	$ 0.1
Tax expense associated with deferred tax asset valuation allowance	16.7
Tax Act, tax on accumulated earnings of foreign subsidiaries	$ 0.3
Percentage for recognition of uncertain tax positions, minimum	50.00%
Effective income tax rate	(141.80%)	1032.80%
Federal
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	$ 5.8
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	22.8
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	8.2
State
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	0.3
Operating loss carryforwards	$ 0.1