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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
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Opening balance     $ (171.4)  
Other comprehensive income/(loss) before reclassifications     (3.8)  
Amounts reclassified from AOCL     2.0  
Total other comprehensive income/(loss) 0.8 1.0 (1.8) 1.1
Closing balance (173.2)   (173.2)  
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)  
Total other comprehensive income/(loss)     (0.1)  
Closing balance 0   0  
Cumulative Translation Adjustments [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Opening balance     (34.9)  
Other comprehensive income/(loss) before reclassifications     (3.8)  
Amounts reclassified from AOCL     0  
Total other comprehensive income/(loss)     (3.8)  
Closing balance (38.7)   (38.7)  
Defined Benefit Pension Plan Items [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Opening balance     (136.6)  
Other comprehensive income/(loss) before reclassifications     0  
Amounts reclassified from AOCL     2.1  
Total other comprehensive income/(loss)     2.1  
Closing balance $ (134.5)   $ (134.5)