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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 |

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