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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 27, 2020
Mar. 29, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Summary of fair values of assets and liabilities measured on a recurring basis
The following table provides a summary of the fair values of our derivative financial instruments measured on a recurring basis under the ASC on “Fair Value Measurements and Disclosures” (U.S. dollars in millions): 

 
Fair value measurements
 
Foreign currency forward contracts, net asset
 
Bunker fuel contracts, net liability
 
Interest rate contracts, net liability
 
March 27,
2020
 
December 27,
2019
 
March 27,
2020
 
December 27,
2019
 
March 27,
2020
 
December 27,
2019
Quoted prices in active markets for identical assets (Level 1)
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Significant observable inputs (Level 2)
0.1

 
1.0

 
(8.3
)
 
—

 
(54.8
)
 
(30.3
)
Significant unobservable inputs (Level 3)
—

 
—

 
—

 
—

 
—

 
—


  
Schedule of non-recurring fair value measurements