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Classification and measurement of financial instruments (Tables)
12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Summary of Carrying Amounts and Fair Values of Financial Assets and Liabilities
   
2019

$m
   
2018

Restated

$m
 
Financial assets
          
Financial assets measured at fair value through other comprehensive income:
          
Equity securities (note 1
7
)
  
 
133
 
   116 
Financial assets measured at fair value through profit or loss:
 
 
 
 
 
 
 
 
 
Money market funds:
 
 
 
 
 
 
 
 
Cash and cash equivalents (note 19)
 
 
 
35
 
 
 
76
 
Other financial assets (note 17)
  
 
16
 
   16 
Other financial assets (note 17)
 
 
3
 
 
 
—  
 
Derivative financial instruments (note 24)
  
 
1
 
   8 
   
 
55
 
   100 
Financial assets measured at amortised cost:
          
Cash and cash equivalents (note 19)
  
 
160
 
   628 
Other financial assets (note 17)
  
 
136
 
   129 
Trade and other receivables, excluding prepayments (note 18)
  
 
552
 
   502 
   
 
848
 
   1,259 
Financial liabilities
          
Financial liabilities measured at fair value through profit or loss:
          
Contingent purchase consideration (note 20)
 
  
 
(91
   (109
Derivative financial instruments (note 24)
  
 
(20
  
 
 
 
 
 
  
 
(111
  
 
(109
Financial liabilities measured at amortised cost:
          
Loans and other borrowings (note 22)
  
 
(2,165
   (2,014
Trade and other payables, excluding deferred and contingent purchase consideration (note 20)
  
 
(570
   (610
Deferred purchase consideration (note 20)
  
 
(23
   (22
   
 
(2,758
   (2,646
Summary of Fair Value Measurement Hierarchy of Assets and Liabilities
   
2019
   2018
Restated
 
   
Fair value
   Fair value 
   
Carrying
value
   
Level 1
$m
   
Level 2
$m
   
Level 3
$m
   
Total

$m
   Carrying
value
  Level 1
$m
  Level 2
$m
   Level 3
$m
  Total
$m
 
Assets
                                              
Equity securities
  
 
133
 
  
 
8
 
  
 
 
  
 
125
 
  
 
133
 
   116   8   —      
108
   116 
 
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
  
 
 
  
 
 
   
 
 
  
 
 
 
Derivative financial instruments
  
 
1
 
  
 
 
  
 
1
 
  
 
 
  
 
1
 
   8   —     
8
    —     8 
 
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
  
 
 
  
 
 
   
 
 
  
 
 
 
Money market funds
  
 
51
 
  
 
51
 
  
 
 
 
 
  
 
 
 
 
  
 
51
 
   
92
   
92
   
 
 
    —     92 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
  
 
 
  
 
 
   
 
 
  
 
 
 
Trade deposits and loans
  
 
3
 
 
 
—  
 
 
 
—  
 
 
 
3
 
 
 
3
 
 
 
—  
 
 
 
—  
 
 
 
—  
 
  
 
—  
 
 
 
—  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Liabilities
                                               
Derivative financial instruments
  
 
(20
 
 
—  
 
 
 
(20
 
 
—  
 
 
 
(20
 
 
—  
 
 
 
—  
 
 
 
—  
 
  
 
—  
 
 
 
—  
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
Contingent purchase consideration
  
 
(91
 
 
—  
 
 
 
—  
 
 
 
(91
 
 
(91
 
 
(109
 
 
—  
 
 
 
—  
 
  
 
(109
 
 
(109
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
Deferred purchase consideration
  
 
(23
  
 
(24
  
 
—  
 
  
 
—  
 
  
 
(24
   (22  (22  —      —     
(22
)
   
 
 
 
  
 
 
 
  
 
 
   
 
 
   
 
 
 
  
 
 
  
 
 
  
 
 
   
 
 
  
 
 
 
£400m 3.875% bonds 2022
  
 
(528
  
 
(567
  
 
 
  
 
 
  
 
(567
   (509  (543  —      —     (543
   
 
 
 
  
 
 
 
  
 
 
   
 
 
   
 
 
 
  
 
 
  
 
 
  
 
 
   
 
 
  
 
 
 
£300m 3.75% bonds 2025
  
 
(399
  
 
(435
  
 
 
  
 
 
  
 
(435
   (385  (399  —      —     (399
   
 
 
 
  
 
 
 
  
 
 
   
 
 
   
 
 
 
  
 
 
  
 
 
  
 
 
   
 
 
  
 
 
 
£350m 2.125% bonds 2026
  
 
(462
  
 
(465
  
 
 
  
 
 
  
 
(465
   (447  (417  —      —     (417
   
 
 
 
  
 
 
 
  
 
 
   
 
 
   
 
 
 
  
 
 
  
 
 
  
 
 
   
 
 
  
 
 
 
€500m 2.125% bonds 2027
  
 
(564
  
 
(601
  
 
 
  
 
 
  
 
(601
   (569  (566  —      —     (566
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
  
 
 
  
 
 
   
 
 
  
 
 
 
Summary of Reconciliation of Movements in the Fair Values of Financial Instruments Classified as Level 3
The following table reconciles the movements in the fair values of financial instruments classified as Level 3 during the year:
 
      
Other financial
   
Contingent purchase
 
      
assets
   
consideration
 
      
$m
   
$m
 
At 1 January 2018
      117    —   
      
 
 
   
 
 
 
Additions
      4    —   
      
 
 
   
 
 
 
Acquisition of businesses (note 11)
      —      (109
)
      
 
 
   
 
 
 
Disposals
      (1   —   
      
 
 
   
 
 
 
Valuation losses recognised in other comprehensive income
      (10   —   
      
 
 
   
 
 
 
Contingent purchase consideration paid, included in net cash from investing activities
      —      4 
      
 
 
   
 
 
 
Change in fair value 
      —      (4
      
 
 
   
 
 
 
Exchange and other adjustments
      (2    
      
 
 
   
 
 
 
At 31 December 2018
      108    (109
      
 
 
   
 
 
 
Additions
      
8
    —   
      
 
 
   
 
 
 
Acquisition of businesses (note 11)
      
1
    
(15
)
      
 
 
   
 
 
 
Disposals
      
(1
   
—  
 
      
 
 
   
 
 
 
Valuation gains recognised in other comprehensive income
      
12
    
—  
 
      
 
 
   
 
 
 
Contingent purchase consideration paid:
      
 
    
 
 
      
 
 
   
 
 
 
Included in net cash from operating activities
 
 
 
 
 
—  
 
 
 
6
 
 
 
 
 
 
 
 
 
 
 
 
Included in net cash from investing activities
 
 
 
 
 
—  
 
 
 
2
 
 
 
 
 
 
 
 
 
 
 
 
Change in fair value (of which $38m is recorded within exceptional items)
  
 
  
 
—  
 
  
 
27
 
      
 
 
   
 
 
 
Exchange and other adjustments
      
—  
    
(2
      
 
 
   
 
 
 
At 31 December 2019
     
 
128
 
  
 
(91
)