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Noncontrolling interests (Tables)
 3 Months Ended
Mar. 30, 2018
Noncontrolling Interest [Abstract]  
Reconciliation of shareholders' equity attributable to noncontrolling interests
The following table reconciles shareholders’ equity attributable to noncontrolling interests (U.S. dollars in millions):
 
 
Quarter ended
 
March 30,
2018
 
March 31,
2017
Noncontrolling interests, beginning
$
23.8

 
$
24.6

Net income (loss) attributable to noncontrolling interests
1.3

 
(0.8
)
Distributions to noncontrolling interests
(0.5
)
 
—

Noncontrolling interests, ending
$
24.6

 
$
23.8