Income Taxes - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Mar. 31, 2010	Sep. 30, 2018	Oct. 01, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal annual utilization of NOL carryforwards limit, next five years	$ 27.0
Threshold period for change in allowed annual amount of NOL to be recognized	5 years
Federal annual utilization of NOL carryforwards limit, after year five	$ 11.6
Unrecognized tax benefits that if recognized would impact the effective tax rate for continuing operations				$ 14.0
Unrecognized tax benefits increase current and prior year positions		$ 3.0
Discontinued operation, unrecognized tax benefits				$ 1.6
Unrecognized tax benefits, decrease from discontinued operations		1.6
Expense for interest and penalties		0.5	$ 0.4
Decrease in interest and penalties		0.8
Liabilities for uncertain tax positions that could expire within twelve months		$ 0.4