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Fair Value Measurements - (Tables)
 6 Months Ended
Jun. 27, 2020
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 June 27, 2020 and December 28, 2019 were as follows:
 June 27, 2020December 28, 2019
(in millions of U.S. dollars)Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
5.500% senior notes due in 2024 1, 2
$500.1  $500.1  $493.5  $514.5  
5.500% senior notes due in 2025 1, 2
742.4  744.2  741.8  775.3  
Total$1,242.5  $1,244.3  $1,235.3  $1,289.8  
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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 June 27, 2020 and December 28, 2019.