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Shareholders' Equity (Narrative) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 27, 2019 | Jun. 28, 2019 | Mar. 29, 2019 | Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Sep. 27, 2019 | Nov. 30, 2017
Equity, Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Repurchased During Period, Value | $ 120.8 | $ 19.0 | $ 40.0 | $ 0.0 | $ 0.0 | $ 50.0 |  |
Two Thousand Seventeen Stock Repurchase Program [Member] |  |  |  |  |  |  |  |
Equity, Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | 172.4 |  |  |  |  |  | $ 172.4 |
Retained Earnings [Member] |  |  |  |  |  |  |  |
Equity, Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Repurchased During Period, Value | $ 99.5 | $ 16.1 | $ 33.5 | $ 0.0 | $ 0.0 | $ 42.5 | $ 149.1 |
Maximum | Two Thousand Seventeen Stock Repurchase Program [Member] |  |  |  |  |  |  |  |
Equity, Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program approved amount |  |  |  |  |  |  |  | $ 600.0
Open Market Purchases [Member] | Two Thousand Seventeen Stock Repurchase Program [Member] |  |  |  |  |  |  |  |
Equity, Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares | 3.3 |  |  |  |  |  | 4.7 |
Accelerated Share Repurchases, Final Price Paid Per Share | $ 37.57 |  |  |  |  |  | $ 38.51 |
Stock Repurchased During Period, Value | $ 120.8 |  |  |  |  |  | $ 179.8 |

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