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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
€ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Jan. 31, 2018
USD ($)
Dec. 31, 2015
EUR (€)
Cross currency swap contract | Net Investment Hedging              
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 (2.1) $ 16.2 4.8 $ 11.6      
Revolving Credit Facility | Net Investment Hedging              
Derivative [Line Items]              
Derivative, notional amount | €             € 160.0
Foreign Exchange Contract | Net Investment Hedging              
Derivative [Line Items]              
Gain (loss) on derivative used in net investment hedge, net of tax 0.3 $ 21.2 2.0 $ 10.9      
Foreign Exchange Contract | Cash Flow Hedging              
Derivative [Line Items]              
Derivative, notional amount $ 148.6   $ 148.6   $ 127.0