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Summary of Capped Call (Equity Options) Issued (Detail) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2018
Jun. 29, 2019
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Jul. 01, 2017
Jun. 29, 2019
Jun. 30, 2018
Dec. 29, 2018
Option Indexed to Issuer's Equity [Line Items]                  
Option Indexed to Issuer's Equity, Strike Price   $ 161.66       $ 162.27 $ 161.66    
Document Period End Date             Jun. 29, 2019    
Long-term Debt           $ 750.0      
Original Number of Options           4,600,000   3,200,000  
Net Premium Paid         $ 57.3        
Common Stock, Par or Stated Value Per Share       $ 100   $ 100 $ 100    
Payments for Repurchase of Common Stock   $ 1.1 $ 300.0 $ 201.3     $ 9.2 $ 212.7  
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 $ 156.72    
Maximum [Member]                  
Option Indexed to Issuer's Equity [Line Items]                  
Option Indexed to Issuer's Equity, Strike Price $ 203.92         179.53 $ 203.74    
Capped call (equity options)                  
Option Indexed to Issuer's Equity [Line Items]                  
Common Stock Price Per Share           $ 5.43   $ 17.96