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Derivative Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - Designated as Hedging Instrument - Derivatives in Net Investment Hedging Relationship - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Derivative [Line Items]    
Assets $ 66.6 $ 66.1
Liabilities (54.9) (61.7)
Forward contracts    
Derivative [Line Items]    
Assets 47.6 32.0
Liabilities (0.3) (1.4)
Put options    
Derivative [Line Items]    
Assets 0.0 0.0
Liabilities (54.6) (60.3)
Call options    
Derivative [Line Items]    
Assets 19.0 34.1
Liabilities $ 0.0 $ 0.0