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Derivative Contracts - Additional Information (Details) - Foreign Exchange Contracts - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Purchase of US and foreign exchange $ 1,257.3 $ 751.6
Collateral provided to counterparties as security for the Company's net liability position 2.3 0.6
Not Designated as Hedging Instrument | Derivative At Fair Value    
Derivative Instruments, Gain (Loss) [Line Items]    
Purchase of US and foreign exchange 496.5 577.7
Not Designated as Hedging Instrument | Liabilities Under Derivative Contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Purchase of US and foreign exchange 760.8 173.9
Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Collateral provided to counterparties as security for the Company's net liability position 0.0 0.0
Designated as Hedging Instrument | Derivative At Fair Value    
Derivative Instruments, Gain (Loss) [Line Items]    
Purchase of US and foreign exchange 0.0 60.6
Designated as Hedging Instrument | Liabilities Under Derivative Contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Purchase of US and foreign exchange 94.3 0.0
Change In Fair Value Of Derivatives | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) to net income from derivative instruments (31.8) 27.7
Net change from current period hedged transactions | Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on foreign currency fair value hedge derivatives (2.1) 3.0
General, administrative and corporate expenses | Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on foreign currency fair value hedge derivatives $ (1.2) $ 4.4