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Derivatives - Derivatives Offsetting Liabilities (Details) - Interest Rate Swap
$ in Millions
Dec. 31, 2018
USD ($)
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract]  
Gross Amount of Liabilities Presented in the Consolidated Balance Sheets $ 6.8
Financial Instruments (3.2)
Cash Collateral Received 0.0
Net Amount $ 3.6