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Debt Financing - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Debt Disclosure [Line Items]      
Weighted-average interst rate on short-term borrowings 2.20% 2.00%  
Debt, face amount $ 3,779.5 $ 10,220.0 $ 1,540.6
Additional paid-in capital 6,757.9 6,533.4  
Revolving Credit Facility Expiring In Twenty Nineteen | Unused lines of Credit [Member]      
Debt Disclosure [Line Items]      
Unused Line of credit $ 2,500.0    
Unused Line of credit agreement, fees 0.07%    
Line of Credit Facility, Commitment Fee Description Fees and interest rates on this line are based on the Company’s long-term credit rating assigned by Moody’s and Standard & Poor’s    
Outside the U.S.      
Debt Disclosure [Line Items]      
Foreign currency bank line borrowings $ 192.0 731.6  
Outside the U.S. | Unused lines of Credit [Member]      
Debt Disclosure [Line Items]      
Line of Credit Facility, Currency denominated in various currencies    
Line of Credit Facility, Interest Rate Description local market rates of interest    
U.S.      
Debt Disclosure [Line Items]      
Commercial Paper $ 799.8 $ 869.6