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Fair Value Measurements - (Tables)
 9 Months Ended
Sep. 30, 2023
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 September 30, 2023 and December 31, 2022 were as follows:
 September 30, 2023December 31, 2022
(in millions of U.S. dollars)Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
3.875% senior notes due in 2028 1,2
$469.3 $422.5 $473.5 $418.7 
4.375% senior notes due in 2029 1,2
742.4 636.5 741.4 642.2 
Total$1,211.7 $1,059.0 $1,214.9 $1,060.9 
______________________
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 September 30, 2023 and December 31, 2022.