Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program Remaining Authorized Repurchase Amount1	$ 7.7
Stock repurchase program remaining number of shares authorized to be repurchased	478,691
SharePrice	$ 16.15
legal surplus	$ 87.6	$ 81.5
Preferred Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Preferred Stock Issue Costs	13.6	13.6
Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Common Stock Issuance Cost	$ 10.1	$ 10.1