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Summary of Capped Call (Equity Options) Issued (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2018
Jul. 01, 2017
Apr. 01, 2017
Dec. 30, 2017
Option Indexed to Issuer's Equity [Line Items]        
Document Period End Date Mar. 31, 2018      
Long-term Debt   $ 750.0    
Original Number of Options 3,200,000 4,600,000    
Net Premium Paid $ 57.3 $ 25.1    
Common Stock, Par or Stated Value Per Share $ 100 $ 100    
Equity Units Conversion Rate Number Of Common Stock Shares 0.7248 0.7241    
Payments for Repurchase of Common Stock $ 11.4   $ 13.5  
Common Stock, Shares, Issued 176,902,738     176,902,738
Cash Settlement on Forward Stock Purchase Contract $ 750.0      
Capped call (equity options)        
Option Indexed to Issuer's Equity [Line Items]        
Common Stock Price Per Share $ 17.96 $ 5.43