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Reclassifications Out of Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Opening balance     $ (106.3)  
Other comprehensive income/(loss) before reclassifications     (4.7)  
Amounts reclassified from AOCL     1.5  
Total other comprehensive income/(loss) $ 4.0 $ 1.8 (3.2) $ 1.4
Closing balance (109.5)   (109.5)  
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  
Amounts reclassified from AOCL     1.5  
Total other comprehensive income/(loss)     1.5  
Closing balance (55.8)   (55.8)  
Cumulative Translation Adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Opening balance     (49.0)  
Other comprehensive income/(loss) before reclassifications     (4.7)  
Amounts reclassified from AOCL     0.0  
Total other comprehensive income/(loss)     (4.7)  
Closing balance $ (53.7)   $ (53.7)