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Stockholders' Equity - Changes in Each Component of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance $ (84.6) $ (40.3) $ (79.5) $ (41.9)
Other comprehensive income (loss) before reclassifications (1.4) (8.8) (8.9) (9.1)
Amounts reclassified from accumulated other comprehensive loss 1.2 0.7 3.6 2.6
Net current-period other comprehensive income (loss) (0.2) (8.1) (5.3) (6.5)
Ending Balance (84.8) (48.4) (84.8) (48.4)
Actuarial Losses        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance (77.6) (56.7) (79.8) (58.1)
Other comprehensive income (loss) before reclassifications 0.6 0.6 0.4 0.3
Amounts reclassified from accumulated other comprehensive loss 1.2 0.8 3.6 2.5
Net current-period other comprehensive income (loss) 1.8 1.4 4.0 2.8
Ending Balance (75.8) (55.3) (75.8) (55.3)
Foreign Currency Translation        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance (7.1) 16.4 0.2 16.0
Other comprehensive income (loss) before reclassifications (2.0) (9.6) (9.3) (9.4)
Amounts reclassified from accumulated other comprehensive loss 0.0 (0.1) 0.0 0.1
Net current-period other comprehensive income (loss) (2.0) (9.7) (9.3) (9.3)
Ending Balance (9.1) 6.7 (9.1) 6.7
Unrealized Gain on Derivatives        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance 0.1 0.0 0.1 0.2
Other comprehensive income (loss) before reclassifications 0.0 0.2 0.0 0.0
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0 0.0 0.0
Net current-period other comprehensive income (loss) 0.0 0.2 0.0 0.0
Ending Balance $ 0.1 $ 0.2 $ 0.1 $ 0.2