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Reclassifications Out of Accumulated Other Comprehensive Income/(Loss) - Changes in Accumulated Other Comprehensive Loss (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Opening balance $ (152.1) $ (102.1) $ (115.5)
Other comprehensive income/(loss) before reclassifications 1.2    
Actuarial net losses arising during the year (6.7) (58.5) 19.5
Amounts reclassified from AOCL 3.7    
Net current period other comprehensive income/(loss) (1.8)    
Closing balance (153.9) (152.1) (102.1)
Unrealized Gains/(Losses) on Derivative Instruments [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Opening balance 0.1    
Other comprehensive income/(loss) before reclassifications 0    
Amounts reclassified from AOCL (0.1)    
Net current period other comprehensive income/(loss) (0.1)    
Closing balance 0    
Cumulative Translation Adjustments [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Opening balance (34.9)    
Other comprehensive income/(loss) before reclassifications 1.2    
Amounts reclassified from AOCL 0    
Net current period other comprehensive income/(loss) 1.2    
Closing balance (33.7)    
Defined Benefit Pension Plan Items [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Opening balance (117.3)    
Other comprehensive income/(loss) before reclassifications 0    
Actuarial net losses arising during the year (6.7)    
Amounts reclassified from AOCL 3.8    
Net current period other comprehensive income/(loss) (2.9)    
Closing balance $ (120.2)