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Change in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance $ (79.5) $ (41.9)
Other comprehensive income (loss) before reclassifications (14.1) (40.5)
Amounts reclassified from accumulated other comprehensive income (loss) 4.8 2.9
Net current-period other comprehensive income (loss) (9.3) (37.6)
Ending balance (88.8) (79.5)
Actuarial Losses [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (79.8) (58.1)
Other comprehensive income (loss) before reclassifications (0.6) (24.6)
Amounts reclassified from accumulated other comprehensive income (loss) 4.8 2.9
Net current-period other comprehensive income (loss) 4.2 (21.7)
Ending balance (75.6) (79.8)
Foreign Currency Translation [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance 0.2 16.0
Other comprehensive income (loss) before reclassifications (13.5) (15.8)
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0
Net current-period other comprehensive income (loss) (13.5) (15.8)
Ending balance (13.3) 0.2
Unrealized Gain (Loss) on Derivatives [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance 0.1 0.2
Other comprehensive income (loss) before reclassifications 0.0 (0.1)
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0
Net current-period other comprehensive income (loss) 0.0 (0.1)
Ending balance $ 0.1 $ 0.1