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Long- Term Debt to Affiliated Trust Long-Term Debt to Affiliated Trust (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2000
Dec. 31, 1997
Debt Instrument [Line Items]      
Payments for Repurchase of Trust Preferred Securities   $ 10.0  
Equity Method Investment, Ownership Percentage 100.00%    
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust $ 51.5   $ 51.5
Trust Preferred Securities Subject to Mandatory Redemption [Member]      
Debt Instrument [Line Items]      
Proceeds from Issuance of Trust Preferred Securities     50.0
Debt Instrument, Description of Variable Rate Basis LIBOR    
Debt Instrument, Basis Spread on Variable Rate 0.875%    
Common Trust Securities [Member]      
Debt Instrument [Line Items]      
Proceeds from Issuance of Trust Preferred Securities     $ 1.5