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Credit and Other Debt Agreements - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 27, 2017
Jun. 13, 2017
Jun. 30, 2017
Debt Instrument [Line Items]      
Realized a cash gain on hedging transaction     $ 8.3
Senior Fixed Rate Notes [Member] | Note Purchase Agreements [Member]      
Debt Instrument [Line Items]      
Notes issued and sold     $ 598.0
Weighted average interest rate of notes     4.04%
6.44% Senior Notes, Series B [Member] | Note Purchase Agreements [Member]      
Debt Instrument [Line Items]      
Notes issued and sold     $ 300.0
Debt instrument, maturity date     Aug. 03, 2017
Private Placement [Member] | Senior Unsecured Notes [Member] | Note Purchase Agreements [Member]      
Debt Instrument [Line Items]      
Notes issued and sold $ 250.0 $ 648.0  
Weighted average interest rate of notes 4.19%    
Weighted Average [Member] | Senior Fixed Rate Notes [Member] | Note Purchase Agreements [Member]      
Debt Instrument [Line Items]      
Weighted average maturity of notes     11 years 7 months 6 days