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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
Dec. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Assets $ 3.5 $ 38.9
Liabilities (4.2) (32.0)
Forward contracts    
Derivative [Line Items]    
Assets 3.5 23.8
Liabilities (2.3) (1.0)
Put options    
Derivative [Line Items]    
Assets 0.0 0.0
Liabilities 0.0 (31.0)
Call options    
Derivative [Line Items]    
Assets 0.0 15.1
Liabilities 0.0 0.0
Interest rate swap    
Derivative [Line Items]    
Assets 0.0 0.0
Liabilities $ (1.9) $ 0.0