Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	May. 05, 2015	Mar. 28, 2015	Dec. 31, 2014	Sep. 27, 2014	May. 20, 2014
Stockholders Equity Note Disclosure [Line Items]
Share repurchase (in shares)	3.1
Repurchase of common stock, value	$ 200.0	$ 450.7
Dividends payable amount (USD per share)	$ 0.32			$ 0.32	$ 0.30	$ 0.30	$ 1.20
Dividends Payable, Amount Per Share, Quarterly Dividends Declared			$ 0.32		0.32		$ 0.30
Dividends Payable, Amount Per Share, Increase (Decrease) in Quarterly Dividends Declared					$ 0.02
Dividends payable	$ 57.6				$ 116.8
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