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(Derivatives Pretax Amounts Affecting Income and Other Comprehensive Income) (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Derivatives in Cash Flow Hedging Relationships    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Reclassified into Income from Accumulated OCI (Effective Portion) $ 9.2 $ 18.3
Gain (Loss) Recognized in Accumulated OCI (Effective Portion) (47.5) (11.5)
Net Investment Hedging Relationships    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Reclassified into Income from Accumulated OCI (Effective Portion) 8.0 (18.3)
Gain (Loss) Recognized in Accumulated OCI (Effective Portion) (1,001.1) 19.8
Derivatives Not Designated as Hedging Instruments    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing and Ineffective Portion) $ 32.4 $ 3.1