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Fair Value Measurements - (Tables)
 3 Months Ended
Mar. 30, 2024
Fair Value Disclosures [Abstract]  
Carrying Value and Estimated Fair Values of Outstanding Debt The carrying values and estimated fair values of our significant outstanding debt as of March 30, 2024 and December 30, 2023 were as follows:
 March 30, 2024December 30, 2023
(in millions of U.S. dollars)Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
3.875% senior notes due in 2028 1,2
$481.6 $468.1 $494.6 $477.5 
4.375% senior notes due in 2029 1,2
743.1 687.3 742.8 683.1 
Total$1,224.7 $1,155.4 $1,237.4 $1,160.6 
______________________
1The fair values were based on the trading levels and bid/offer prices observed by a market participant and are considered Level 2 financial instruments.
2Carrying value of our significant outstanding debt is net of unamortized debt issuance costs as of March 30, 2024 and December 30, 2023.