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Derivatives and Risk Management (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
May 31, 2023
May 31, 2022
May 31, 2021
May 31, 2020
May 31, 2019
Dec. 31, 2017
Foreign Currency Forward & Foreign Currency Option Contracts [Member]              
Derivative [Line Items]              
Derivative, Notional Amount $ 185.8           $ 162.2
Debt [Member] | Interest Rate Swap [Member]              
Derivative [Line Items]              
Derivative, Notional Amount   $ 400.0 $ 400.0 $ 500.0 $ 750.0 $ 900.0  
Derivative, Liquidation Proceeds, Monetary Amount $ 5.6