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Stockholders' Equity - Changes in Each Component of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance $ (88.8) $ (79.5)
Other comprehensive income before reclassifications 1.7 (11.1)
Amounts reclassified from accumulated other comprehensive loss 9.1 1.1
Net current-period other comprehensive income (loss) 10.8 (10.0)
Ending Balance (78.0) (89.5)
Actuarial Losses    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (75.6) (79.8)
Other comprehensive income before reclassifications 0.3 0.8
Amounts reclassified from accumulated other comprehensive loss 1.5 1.1
Net current-period other comprehensive income (loss) 1.8 1.9
Ending Balance (73.8) (77.9)
Foreign Currency Translation (c)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (13.3) 0.2
Other comprehensive income before reclassifications 1.4 (11.9)
Amounts reclassified from accumulated other comprehensive loss 7.7 0.0
Net current-period other comprehensive income (loss) 9.1 (11.9)
Ending Balance (4.2) (11.7)
Unrealized Gain on Derivatives    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance 0.1 0.1
Other comprehensive income before reclassifications 0.0 0.0
Amounts reclassified from accumulated other comprehensive loss (0.1) 0.0
Net current-period other comprehensive income (loss) (0.1) 0.0
Ending Balance $ 0.0 $ 0.1