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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
Sep. 30, 2018
USD ($)
Other Investments  
Derivative [Line Items]  
Assets $ 1.0 [1]
Other Liabilities  
Derivative [Line Items]  
Liabilities 4.5 [2]
Forward contracts | Other Investments  
Derivative [Line Items]  
Assets 1.0 [1]
Forward contracts | Other Liabilities  
Derivative [Line Items]  
Liabilities 6.4 [2]
Put option | Other Investments  
Derivative [Line Items]  
Assets 0.0 [1]
Put option | Other Liabilities  
Derivative [Line Items]  
Liabilities 21.6 [2]
Call option | Other Investments  
Derivative [Line Items]  
Assets 0.0 [1]
Call option | Other Liabilities  
Derivative [Line Items]  
Liabilities $ (23.5) [2]
[1] Amounts are presented in Other investments and assets in the Consolidated Condensed Balance Sheets.
[2] Amounts are presented in Other liabilities in the Consolidated Condensed Balance Sheets.