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Retirement Plans - Narrative (Detail)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Pension_Plan
Dec. 31, 2014
USD ($)
Pension_Plan
Dec. 31, 2013
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Reduction in pension obligation     $ 404.0  
Pension and other post retirement non-cash settlement expense $ 95.7      
Pension and postretirement contributions   $ 25.6 41.9 $ 29.6
Defined benefit plan, accumulated benefit obligation $ 4,428.5 $ 4,088.8 4,428.5  
Threshold for recognition in net periodic benefit costs, percentage of projected benefit obligation or fair value of plan assets   10.00%    
Other Charges   $ 24.6 35.5 38.4
Multi-employer plan, period contributions   $ 0.2 0.3 1.3
Courier Corporation        
Defined Benefit Plan Disclosure [Line Items]        
Multi-employer pension plan company's contributions percentage   85.00%    
Number of multi-employer pension plans | Pension_Plan   2    
Multi-employer pension plan withdrawal obligations        
Defined Benefit Plan Disclosure [Line Items]        
Other Charges   $ 5.5 $ 38.5 38.4
Multi-employer pension plan withdrawal obligations | Complete And Partial Withdrawal From Multi Employer Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Other Charges       53.1
Multi-employer pension plan withdrawal obligations | Facility closures        
Defined Benefit Plan Disclosure [Line Items]        
Other Charges       14.7
Multi-Employer Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Number of multi-employer Pension plans withdrawn from | Pension_Plan     4  
Multi-Employer Pension Plans | Multi-employer pension plan withdrawal obligations        
Defined Benefit Plan Disclosure [Line Items]        
Other Charges   $ 5.5 $ 35.5  
Multi-Employer Pension Plans | Multi-employer pension plan withdrawal obligations | Facility closures        
Defined Benefit Plan Disclosure [Line Items]        
Other Charges     3.0  
Hedging Investments        
Defined Benefit Plan Disclosure [Line Items]        
Target asset allocation percentage   40.00%    
Return Seeking Securities        
Defined Benefit Plan Disclosure [Line Items]        
Target asset allocation percentage   60.00%    
Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Reduction in pension obligation   $ 0.0 0.0  
Benefits Paid   195.7 173.4  
Increased benefit obligations     310.0  
Pension and postretirement contributions   15.4    
Medicare reimbursements   0.0 0.0  
Other Postretirement Benefit Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Reduction in pension obligation   0.1 7.4  
Benefits Paid   32.6 34.6  
Pension and postretirement contributions   10.2    
Medicare reimbursements   5.7 4.2  
Pension and Retirement Benefit Plans | Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Pension and other postretirement expected contributions for next year   25.0    
Pension and Retirement Benefit Plans | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Pension and other postretirement expected contributions for next year   30.0    
Postretirement Life Insurance        
Defined Benefit Plan Disclosure [Line Items]        
Reduction in pension obligation       $ 30.1
EGWP        
Defined Benefit Plan Disclosure [Line Items]        
Medicare reimbursements   $ 5.7    
Lump Sum Pension Payment Or Annuity        
Defined Benefit Plan Disclosure [Line Items]        
Benefits Paid     $ 317.7