Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 26, 2015	Sep. 30, 2016	Sep. 26, 2015	Dec. 31, 2015	Dec. 31, 2014
Stockholders Equity Note Disclosure [Line Items]
Common Stock, Shares Authorized	426.0		426.0		426.0
Common Stock, Par or Stated Value Per Share	$ 0.01		$ 0.01		$ 0.01
Dividends Payable, Amount Per Share	0.34		0.34
Treasury Stock, Shares, Retired		19.1
Treasury Stock, Retired, Cost Method, Amount		$ 1,200.0
Common Stock, Dividends, Per Share, Cash Paid	$ 0.34	$ 0.32	$ 1.00	$ 0.96
Share repurchase (in shares)	0.0	3.1
Repurchase of common stock, value		$ 200.0		$ 200.0
ApprovedNotDeclaredlDividends					$ 1.34
Dividends payable	$ 0.0		$ 0.0		$ 59.6
December 2014 Share Repurchase Program [Member]
Stockholders Equity Note Disclosure [Line Items]
Repurchase of shares of our common stock up to a maximum aggregate value						$ 1,000.0
Common stock authorized for repurchase, expiration date	Dec. 31, 2019
Share repurchase program remaining available amount	$ 800.0		$ 800.0
Treasury shares
Stockholders Equity Note Disclosure [Line Items]
Treasury Stock, Shares, Retired				19.1
Treasury Stock, Retired, Cost Method, Amount				$ 1,210.9
Share repurchase (in shares)				0.0
Repurchase of common stock, value				$ 0.0
First Quarter [Member]
Stockholders Equity Note Disclosure [Line Items]
ApprovedNotDeclaredlDividends					$ 0.33
Second Quarter [Member] [Member]
Stockholders Equity Note Disclosure [Line Items]
ApprovedNotDeclaredlDividends					0.33
Third Quarter [Member]
Stockholders Equity Note Disclosure [Line Items]
ApprovedNotDeclaredlDividends					0.34
Fourth Quarter [Member]
Stockholders Equity Note Disclosure [Line Items]
ApprovedNotDeclaredlDividends					$ 0.34