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Derivative Instruments and Hedging Activities (Notional Values and After-Tax Impact of Changes in Fair Value) (Details) - Designated as Hedging Instrument [Member] - Net Investment Hedging [Member] - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Derivative [Line Items]      
Derivative, notional amount $ 333.4   $ 329.2
Gain (loss) on derivative used in net investment hedge, net of tax $ (4.2) $ (10.0)