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Stockholders' Equity - Changes in Each Component of 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
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance $ (89.5) $ (41.1) $ (79.5) $ (41.9)
Other comprehensive income (loss) before reclassifications 3.6 (0.1) (7.5) (0.3)
Amounts reclassified from accumulated other comprehensive loss 1.3 0.9 2.4 1.9
Net current-period other comprehensive income 4.9 0.8 (5.1) 1.6
Ending Balance (84.6) (40.3) (84.6) (40.3)
Actuarial Losses        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance (77.9) (57.3) (79.8) (58.1)
Other comprehensive income (loss) before reclassifications (1.0) (0.2) (0.2) (0.3)
Amounts reclassified from accumulated other comprehensive loss 1.3 0.8 2.4 1.7
Net current-period other comprehensive income 0.3 0.6 2.2 1.4
Ending Balance (77.6) (56.7) (77.6) (56.7)
Foreign Currency Translation        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance (11.7) 16.0 0.2 16.0
Other comprehensive income (loss) before reclassifications 4.6 0.3 (7.3) 0.2
Amounts reclassified from accumulated other comprehensive loss 0.0 0.1 0.0 0.2
Net current-period other comprehensive income 4.6 0.4 (7.3) 0.4
Ending Balance (7.1) 16.4 (7.1) 16.4
Unrealized Gain (Loss) on Derivatives        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance 0.1 0.2 0.1 0.2
Other comprehensive income (loss) before reclassifications 0.0 (0.2) 0.0 (0.2)
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0 0.0 0.0
Net current-period other comprehensive income 0.0 (0.2) 0.0 (0.2)
Ending Balance $ 0.1 $ 0.0 $ 0.1 $ 0.0