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Summary of Capped Call (Equity Options) Issued (Detail) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2018
Sep. 29, 2018
Mar. 31, 2018
Sep. 30, 2017
Jul. 01, 2017
Sep. 29, 2018
Sep. 28, 2018
Sep. 30, 2017
Dec. 30, 2017
Option Indexed to Issuer's Equity [Line Items]                  
Option Indexed to Issuer's Equity, Strike Price   $ 161.96     $ 162.27 $ 161.96      
Document Period End Date           Sep. 29, 2018      
Long-term Debt         $ 750.0        
Original Number of Options     3,200,000   4,600,000        
Net Premium Paid     $ 57.3            
Common Stock, Par or Stated Value Per Share       $ 100   $ 100      
Equity Units Conversion Rate Number Of Common Stock Shares         0.7241 0.7255      
Payments for Repurchase of Common Stock   $ 301.8   $ 0.6   $ 514.5   $ 16.2  
Common Stock, Shares, Issued   176,902,738       176,902,738     176,902,738
Cash Settlement on Forward Stock Purchase Contract           $ 750.0      
Minimum [Member]                  
Option Indexed to Issuer's Equity [Line Items]                  
Option Indexed to Issuer's Equity, Strike Price $ 156.86       $ 162.27 $ 161.96 $ 156.83    
Maximum [Member]                  
Option Indexed to Issuer's Equity [Line Items]                  
Option Indexed to Issuer's Equity, Strike Price $ 203.92       179.53 $ 179.19 $ 203.88    
Capped call (equity options)                  
Option Indexed to Issuer's Equity [Line Items]                  
Common Stock Price Per Share     $ 17.96   $ 5.43