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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 - Net Investment Hedging - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Jan. 31, 2018
Cross currency swap contract            
Derivative [Line Items]            
Derivative, notional amount $ 300.0   $ 300.0   $ 300.0 $ 300.0
Gain (loss) on derivative used in net investment hedge, net of tax 12.0 $ 0.1 16.8 $ 11.7    
Foreign currency denominated debt            
Derivative [Line Items]            
Gain (loss) on derivative used in net investment hedge, net of tax $ 0.5 $ 1.9 $ 2.5 $ 12.8