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Derivative Instruments - Net Investment Hedges in Balance Sheets (Details) - Forward exchange forward contracts - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Derivative [Line Items]    
Derivative assets $ 2.1 $ 1.1
Derivative liability (0.1) $ 0.0
Derivative assets, current 0.6  
Derivative assets, noncurrent $ 1.5