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Summary of Capped Call (Equity Options) Issued (Detail) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2018
Mar. 30, 2019
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Jul. 01, 2017
Dec. 29, 2018
Option Indexed to Issuer's Equity [Line Items]              
Option Indexed to Issuer's Equity, Strike Price   $ 161.76       $ 162.27  
Document Period End Date   Mar. 30, 2019          
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 $ 100  
Equity Units Conversion Rate Number Of Common Stock Shares   0.7264       0.7241  
Payments for Repurchase of Common Stock   $ 8.1 $ 300.0 $ 200.0 $ 11.4    
Common Stock, Shares, Issued   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 $ 156.76       $ 162.27  
Maximum [Member]              
Option Indexed to Issuer's Equity [Line Items]              
Option Indexed to Issuer's Equity, Strike Price $ 203.92 $ 203.79       179.53  
Capped call (equity options)              
Option Indexed to Issuer's Equity [Line Items]              
Common Stock Price Per Share         $ 17.96 $ 5.43