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Accumulated Other Comprehensive Loss - Changes in Each Component of Accumulated Other Comprehensive Loss (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance, Pension Benefit Plan Costs $ (58.1) $ (91.0)
Other comprehensive income (expense) before reclassifications, Pension Benefit Plan Costs (0.1) 1.4
Amounts reclassified from accumulated other comprehensive income, Pension Benefit Plan Costs 0.9 1.9 [1]
Net current-period other comprehensive income (expense, Pension Benefit Plan Costs 0.8 3.3
Ending balance, Pension Benefit Plan Costs (57.3) (87.7)
Beginning balance, Foreign Currency 16.0 10.8
Other comprehensive income (expense) before reclassifications, Foreign Currency (0.1) (5.4)
Amounts reclassified from accumulated other comprehensive income, Foreign Currency 0.1 (0.3) [1]
Net current-period other comprehensive income (expense, Foreign Currency 0 (5.7)
Ending balance, Foreign Currency 16.0 5.1
Beginning balance, Unrealized Gain (Loss) on Derivatives 0.2 0.1
Other comprehensive income (expense) before reclassifications, Unrealized Gain (Loss) on Derivatives 0 (0.6)
Amounts reclassified from accumulated other comprehensive income, Unrealized Gain (Loss) on Derivatives 0 0 [1]
Net current-period other comprehensive income (expense, Unrealized Gain (Loss) on Derivatives 0 (0.6)
Ending balance, Unrealized Gain (Loss) on Derivatives 0.2 (0.5)
Beginning balance, Total (41.9) (80.1)
Other comprehensive income (expense) before reclassifications (0.2) (4.6)
Amounts reclassified from accumulated other comprehensive income 1.0 1.6 [1]
Net current-period other comprehensive income (expense 0.8 (3.0)
Ending balance, Total $ (41.1) $ (83.1)
[1] The change in actuarial losses in the three months ended March 31, 2014 includes $1.3 million of actuarial losses that have been included in the computation of net postretirement pension expense for the period.