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Related Party Transactions (Split Dollar Agreements) (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Chairman, Board of Directors [Member]          
Related Party Transaction [Line Items]          
Payments for life insurance policies $ 0.6 $ 0.6 $ 1.1 $ 1.1  
Chief Executive Officer [Member]          
Related Party Transaction [Line Items]          
Payments for life insurance policies 0.0 $ 0.0 0.7 $ 0.7  
Executive Officers [Member]          
Related Party Transaction [Line Items]          
Life insurance assets, carrying amount $ 20.3   $ 20.3   $ 18.5