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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 - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Derivatives in Net Investment Hedging Relationship    
Derivative [Line Items]    
Assets $ 1.0 $ 38.9
Liabilities (2.6) (32.0)
Derivatives in Net Investment Hedging Relationship | Forward contracts    
Derivative [Line Items]    
Assets 1.0 23.8
Liabilities (0.6) (1.0)
Derivatives in Net Investment Hedging Relationship | Put options    
Derivative [Line Items]    
Assets 0.0 0.0
Liabilities 0.0 (31.0)
Derivatives in Net Investment Hedging Relationship | Call options    
Derivative [Line Items]    
Assets 0.0 15.1
Liabilities 0.0 0.0
Cash Flow Hedging | Interest rate swap    
Derivative [Line Items]    
Assets 0.0 0.0
Liabilities $ (2.0) $ 0.0