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Retirement Plans and Other Post-Retirement Benefits - Retirement Plan is Partially Funded and Claims are Paid as Reported (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Change in Benefit Obligation      
Balance at end of year $ 35.4 $ 36.4  
Change in Plan Assets      
Fair value of plan assets at end of year 601.2 545.7  
Pension Benefits [Member]
      
Change in Benefit Obligation      
Balance at beginning of year 528.4 470.2  
Service cost 11.6 11.3 10.3
Interest cost 21.8 23.0 24.2
Plan amendments    5.5  
Participant contributions        
Actuarial (gain)/loss (43.6) 46.7  
Benefits paid (30.5) (28.3)  
Balance at end of year 487.7 528.4 470.2
Change in Plan Assets      
Fair value of plan assets at beginning of year 545.7 498.2  
Actual return on plan assets 84.2 68.1  
Total contributions 1.8 1.8  
Benefits paid (30.5) (28.3)  
Intra plan transfers    5.9  
Fair value of plan assets at end of year 601.2 545.7 498.2
Funded status at end of year 113.5 17.3  
Other Benefits [Member]
      
Change in Benefit Obligation      
Balance at beginning of year 63.0 56.8  
Service cost 2.9 2.8 2.9
Interest cost 2.1 2.4 2.8
Plan amendments        
Participant contributions 1.4 1.4  
Actuarial (gain)/loss (10.5) 4.2  
Benefits paid (4.1) (4.6)  
Balance at end of year 54.8 63.0 56.8
Change in Plan Assets      
Fair value of plan assets at beginning of year    5.3  
Actual return on plan assets    0.6  
Total contributions 4.1 4.6  
Benefits paid (4.1) (4.6)  
Intra plan transfers    (5.9)  
Fair value of plan assets at end of year       5.3
Funded status at end of year $ (54.8) $ (63.0)