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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 30, 2023
Fair Value Disclosures [Abstract]  
Schedule of Carrying Value and Estimated Fair Values of Outstanding Debt The carrying values and estimated fair values of our significant outstanding debt as of December 30, 2023 and December 31, 2022 were as follows:
 December 30, 2023December 31, 2022
(in millions of U.S. dollars)Carrying ValueFair ValueCarrying ValueFair Value
3.875% senior notes due in 2028 1, 2
$494.6 $477.5 $473.5 $418.7 
4.375% senior notes due in 2029 1, 2
742.8 683.1 741.4 642.2 
Total$1,237.4 $1,160.6 $1,214.9 $1,060.9 
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1     The fair values were based on the trading levels and bid/offer prices observed by a market participant and are considered Level 2 financial instruments.
2     Carrying value of our significant outstanding debt is net of unamortized debt issuance costs as of December 30, 2023 and December 31, 2022 (see Note 16 to the Consolidated Financial Statements).