v3.7.0.1
Financing Components of Debt (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Jun. 20, 2016
Dec. 31, 2015
Debt Instrument [Line Items]        
Long-term borrowings, carrying value $ 3,262.7 $ 3,358.0   $ 0.0
Commercial Paper [Member]        
Debt Instrument [Line Items]        
Long-term borrowings, carrying value   374.8    
US Dollar-Denominated Commercial Paper [Member] | Commercial Paper [Member]        
Debt Instrument [Line Items]        
Long-term borrowings, carrying value 118.5 347.9    
Euro Denominated Commercial Paper [Member] | Commercial Paper [Member]        
Debt Instrument [Line Items]        
Long-term borrowings, carrying value 160.3 26.8    
1.80% Senior Unsecured Notes due 2019 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term borrowings, carrying value $ 298.4 298.3    
Debt Instrument, Interest Rate, Stated Percentage 1.80%   1.80%  
2.35% Senior Unsecured Notes due 2021 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term borrowings, carrying value $ 745.1 744.8    
Debt Instrument, Interest Rate, Stated Percentage 2.35%   2.35%  
3.15% Senior Unsecured Notes due 2026 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term borrowings, carrying value $ 890.4 890.1    
Debt Instrument, Interest Rate, Stated Percentage 3.15%   3.15%  
4.30% Senior Unsecured Notes due 2046 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term borrowings, carrying value $ 546.8 546.8    
Debt Instrument, Interest Rate, Stated Percentage 4.30%   4.30%  
Other Debt [Member]        
Debt Instrument [Line Items]        
Long-term borrowings, carrying value $ 3.2 3.3    
Term Loan [Member]        
Debt Instrument [Line Items]        
Long-term borrowings, carrying value $ 500.0 $ 500.0 $ 500.0  
Debt Instrument, Interest Rate, Stated Percentage   1.87%