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Details of Foreign Exchange Contracts Pre-Tax Amounts (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018 | Dec. 29, 2018
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |
Proceeds from Hedge, Investing Activities |  |  | $ (62.3) | $ 16.6 |
Document Period End Date |  |  | Sep. 28, 2019 |  |
Fair Value Hedging [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |
Derivative, Loss on Derivative | $ 0.8 | $ 0.8 | $ 6.9 | 2.4 |
Net Investment Hedging | Foreign Exchange Contracts |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |
Derivative, Notional Amount | 385.3 |  | 385.3 |  |
Proceeds from Hedge, Investing Activities |  |  | 15.2 |  |
Net Investment Hedging | Currency Swap [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |
Derivative, Notional Amount | 1,200.0 |  | 1,200.0 |  | $ 250.0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts | Other Income And Expense [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | $ 2.0 | $ (5.9) | $ 0.7 | $ 9.0 |

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