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Accumulated other comprehensive loss (Tables)
9 Months Ended
Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Component of other comprehensive loss
The accumulated balances for each component of other comprehensive loss are as follows:
 
 
September 30,
2012
 
December 31,
2011
 
$’000
 
$’000
Foreign currency translation adjustments, net of tax (benefit) of $(255) and $(477)
(76,541
)
 
(52,611
)
Derivative financial instruments, net of tax (benefit) of $(914) and $(970)
(7,442
)
 
(6,440
)
Pension liability, net of tax provision of $2,016 and $2,161
(13,676
)
 
(13,238
)
 
 
 
 
 
(97,659
)
 
(72,289
)