Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Gross amount of the net operating loss carryforwards			$ 414.2
Net operating loss carryforwards	$ 42.0		51.7
Potential benefits			11.5
Interest and penalties included in income tax expense				$ (0.3)
Accrued penalties and interest	1.8		5.4
Currently remaining unrecognized tax positions that may be recognized by the end of following year			$ 1.6
Tax Cuts and Jobs Act of 2017
Operating Loss Carryforwards [Line Items]
Tax Reform Act Tax Expense Charge	$ 2.3	$ 92.0