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Derivatives and Risk Management (Narrative) (Details) - Derivatives Not Designated as Hedging Instruments - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Foreign Exchange Forward          
Derivative [Line Items]          
Notional amount $ 256.0   $ 256.0   $ 231.9
Foreign Exchange Contract | Foreign exchange and other gains (losses)          
Derivative [Line Items]          
Gain (loss) on derivative $ (4.1) $ (5.4) $ (11.7) $ (7.2)