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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2018
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 30, 2018 and December 30, 2017 were as follows:
 
June 30, 2018
 
December 30, 2017
(in millions of U.S. dollars)
Carrying
Value
 
Fair
Value
 
Carrying
Value
 
Fair
Value
10.000% senior notes due in 2021 1, 2
$
—

 
$
—

 
$
269.9

 
$
283.4

5.375% senior notes due in 2022 1, 3
—

 
—

 
519.0

 
539.9

5.500% senior notes due in 2024 1, 3
512.4

 
538.7

 
529.6

 
574.0

5.500% senior notes due in 2025 1, 3
739.6

 
719.3

 
739.0

 
759.3

Total
$
1,252.0

 
$
1,258.0

 
$
2,057.5

 
$
2,156.6

______________________
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
Includes unamortized premium of $19.9 million at December 30, 2017.
3 
Carrying value of our significant outstanding debt is net of unamortized debt issuance costs as of June 30, 2018 and December 30, 2017 (see Note 11 to the Consolidated Financial Statements).