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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Derivative [Line Items]          
Derivative, notional amount $ 368.1   $ 368.1   $ 329.2
Gain (loss) on derivative used in net investment hedge, net of tax $ (11.8) $ (4.8) $ (38.9) $ (8.9)