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Retirement Plans - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]        
Gain on curtailment   $ 3.7 $ 38.7 $ 0.4
Plan amendments 81.5      
Defined benefit plan, accumulated benefit obligation   4,343.9 3,901.7  
Threshold for recognition in net periodic benefit costs, percentage of projected benefit obligation or fair value of plan assets   10.00%    
Pension and other postretirement contributions   148.7 54.6 48.8
Employer matching contributions rate   40.00%    
Maximum participant contributions as a percentage of eligible compensation per pay period   6.00%    
Recognized expense   30.8    
Multi-employer plan, period contributions   1.3 1.7 1.7
Percentage of employer contribution, maximum   5.00% 5.00% 5.00%
Red zone status, percentage   65.00%    
Yellow zone status, percentage   80.00%    
Restructuring Charges   91.9 136.3 65.4
Equity Securities and Other Investments
       
Defined Benefit Plan Disclosure [Line Items]        
Target asset allocation percentage   75.00%    
Fixed Income
       
Defined Benefit Plan Disclosure [Line Items]        
Target asset allocation percentage   25.00%    
Withdrawal from Multiemployer Defined Benefit Plan
       
Defined Benefit Plan Disclosure [Line Items]        
Restructuring Charges   (0.4) 15.1 13.6
Pension Plans, Defined Benefit
       
Defined Benefit Plan Disclosure [Line Items]        
Gain on curtailment   3.7 38.7 0.4
Reduction in pension liability due to curtailment   6.5 61.6  
Plan amendments   2.6 (0.5)  
Pension and other postretirement contributions   140.7 44.7  
Pension and other postretirement Expected contributions for next year   21.7    
Pension and other postretirement Expected contributions for 2014   85    
Other Postretirement Benefit Plans, Defined Benefit
       
Defined Benefit Plan Disclosure [Line Items]        
Deferred compensation arrangement with individual, requisite service period (in years)   2 years    
Plan amendments   0.5 (72.4)  
Pension and other postretirement contributions   8.0 13.2  
Pension and other postretirement Expected contributions for next year   1.4    
Medicare reimbursements   $ 3.3 $ 3.3