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Reclassifications out of Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Opening balance $ (106.3) $ (146.3)  
Other comprehensive income/(loss) before reclassifications (16.3)    
Actuarial net gains arising during the year 3.2 54.7 $ (6.7)
Amounts reclassified from AOCL 8.5    
Net current period other comprehensive income/(loss) (4.6)    
Closing balance (110.9) (106.3) $ (146.3)
Defined Benefit Pension Plan Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Opening balance (57.3)    
Other comprehensive income/(loss) before reclassifications 0.0    
Actuarial net gains arising during the year 3.2    
Amounts reclassified from AOCL 3.2    
Net current period other comprehensive income/(loss) 6.4    
Closing balance (50.9) (57.3)  
Foreign Currency Translation Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Opening balance (49.0)    
Other comprehensive income/(loss) before reclassifications (16.3)    
Actuarial net gains arising during the year 0.0    
Amounts reclassified from AOCL 5.3    
Net current period other comprehensive income/(loss) (11.0)    
Closing balance $ (60.0) $ (49.0)