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Earnings Per Share - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Dec. 30, 2017
Stockholders Equity Note [Line Items]              
Option Indexed to Issuer's Equity, Strike Price     $ 162.05 $ 162.27 $ 162.05    
Equity Unit       $ 750.0   $ 750.0  
Preferred Stock, Liquidation Preference, Value       $ 750.0   $ 750.0  
Preferred Stock Conversion Rate Number Of Common Stock Shares     $ 6.1709 $ 6.1627 $ 6.1709    
Document Period End Date         Jun. 30, 2018    
Long-term Debt         $ 750.0    
Common Stock, Par or Stated Value Per Share   $ 2.5     $ 2.5   $ 2.50
Equity Units Conversion Rate Number Of Common Stock Shares       0.7241 0.7251    
Common Stock, Shares, Issued   176,902,738     176,902,738   176,902,738
Minimum [Member]              
Stockholders Equity Note [Line Items]              
Option Indexed to Issuer's Equity, Strike Price $ 156.86     $ 162.27 $ 162.05    
Maximum [Member]              
Stockholders Equity Note [Line Items]              
Option Indexed to Issuer's Equity, Strike Price $ 203.92     $ 179.53 $ 179.29    
Stock Options [Member]              
Stockholders Equity Note [Line Items]              
Antidilutive securities excluded from the computation of EPS   1,161,000   0 1,162,000 1,163,000