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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
$ in Millions
Dec. 31, 2018
USD ($)
Other Investments  
Derivative [Line Items]  
Assets $ 66.1
Other Liabilities  
Derivative [Line Items]  
Liabilities (61.7)
Forward contracts | Other Investments  
Derivative [Line Items]  
Assets 32.0
Forward contracts | Other Liabilities  
Derivative [Line Items]  
Liabilities (1.4)
Put options | Other Investments  
Derivative [Line Items]  
Assets 0.0
Put options | Other Liabilities  
Derivative [Line Items]  
Liabilities (60.3)
Call options | Other Investments  
Derivative [Line Items]  
Assets 34.1
Call options | Other Liabilities  
Derivative [Line Items]  
Liabilities $ 0.0