Annual report pursuant to Section 13 and 15(d)

Reconciliation of Projected Benefit Obligations, Plan Assets and Funded Status of Plans (Detail)

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Reconciliation of Projected Benefit Obligations, Plan Assets and Funded Status of Plans (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Change in plan assets      
Employer contributions $ 15.6 $ 14.6 $ 13.8
Pension Benefits
     
Change in projected benefit obligation      
Benefit obligation at beginning of year 678.0 624.2  
Service cost 6.4 6.4 5.3
Interest cost 34.5 34.9 35.1
Amendments   0.6  
Actuarial loss (gain) 70.0 50.5  
Foreign currency exchange rate changes (1.2) 1.8  
Benefits paid (41.6) (40.4)  
Benefit obligation at end of year 746.1 678.0 624.2
Change in plan assets      
Fair value of plan assets at beginning of year 569.9 505.4  
Actual return on plan assets 9.2 47.5  
Employer contributions 46.6 55.4  
Foreign currency exchange rate changes (1.1) 2.0  
Benefits paid (41.6) (40.4)  
Fair value of plan assets at end of year 583.0 569.9 505.4
Funded status of plan (163.1) (108.1)  
Other Benefits
     
Change in projected benefit obligation      
Benefit obligation at beginning of year 33.5 33.5  
Service cost 0.6 0.5 0.5
Interest cost 1.6 1.7 1.8
Plan participants' contributions 1.1 1.1  
Actuarial loss (gain) (3.0) 1.2  
Benefits paid (4.0) (4.5)  
Benefit obligation at end of year 29.9 33.5 33.5
Change in plan assets      
Fair value of plan assets at beginning of year 18.9 17.3  
Actual return on plan assets 0.4 1.6  
Employer contributions 2.9 3.4  
Plan participants' contributions 1.1 1.1  
Benefits paid (4.0) (4.5)  
Fair value of plan assets at end of year 19.3 18.9 17.3
Funded status of plan $ (10.6) $ (14.6)