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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On Recurring Basis) (Detail) - Recurring - USD ($) $ in Millions | Oct. 02, 2020 | Jan. 03, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation plan assets | $ 37.2 | $ 36.2
Derivatives assets | 0.4 | 0.3
Total assets measured at fair value | 37.6 | 36.5
Deferred compensation plan liabilities | 37.2 | 36.2
Derivatives liabilities | 0.3 | 1.0
Contingent consideration liabilities | 8.8 | 19.9
Total liabilities measured at fair value | 46.3 | 57.1
Level I |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation plan assets | 37.2 | 36.2
Derivatives assets | 0.0 | 0.0
Total assets measured at fair value | 37.2 | 36.2
Deferred compensation plan liabilities | 37.2 | 36.2
Derivatives liabilities | 0.0 | 0.0
Contingent consideration liabilities | 0.0 | 0.0
Total liabilities measured at fair value | 37.2 | 36.2
Level II |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation plan assets | 0.0 | 0.0
Derivatives assets | 0.4 | 0.3
Total assets measured at fair value | 0.4 | 0.3
Deferred compensation plan liabilities | 0.0 | 0.0
Derivatives liabilities | 0.3 | 1.0
Contingent consideration liabilities | 0.0 | 0.0
Total liabilities measured at fair value | 0.3 | 1.0
Level III |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation plan assets | 0.0 | 0.0
Derivatives assets | 0.0 | 0.0
Total assets measured at fair value | 0.0 | 0.0
Deferred compensation plan liabilities | 0.0 | 0.0
Derivatives liabilities | 0.0 | 0.0
Contingent consideration liabilities | 8.8 | 19.9
Total liabilities measured at fair value | $ 8.8 | $ 19.9

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