General - Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Taxes
Effective income tax rates (as a percent)		26.30%	34.40%
Statutory federal income tax rate (as a percent)		21.00%		35.00%
Tax contingency reserves reversed in the Current Year Quarter	$ 2.0	$ 2.0
Accrued interest reversed	0.2
Deferred Tax Assets, Valuation Allowance	2.4	2.4		$ 2.4
Deferred tax assets
Income Taxes
Tax contingency reserves reversed in the Current Year Quarter	0.4	0.4
Income tax expense
Income Taxes
Tax contingency reserves reversed in the Current Year Quarter	1.6	1.6
Federal
Income Taxes
Taxes paid in resolution of examination	0.3	0.3
Operating Loss Carryforwards	38.1	38.1
State
Income Taxes
Operating Loss Carryforwards	93.7	93.7
AlphaCare | Federal
Income Taxes
Operating Loss Carryforwards	$ 36.9	$ 36.9