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 $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Change in projected benefit obligation        
Benefits paid   $ (62,600,000)    
Change in plan assets        
Employer contributions   17,800,000 15,600,000 14,600,000
Benefits paid   (62,600,000)    
Pension Settlement Charge 38,700,000 38,700,000    
Pension Benefits
        
Change in projected benefit obligation        
Benefit obligation at January 1,   746,100,000 678,000,000  
Service cost   6,500,000 6,400,000 6,400,000
Interest cost   33,400,000 34,500,000 34,900,000
Amendments   7,500,000    
Actuarial loss (gain)   68,700,000 70,000,000  
Foreign currency exchange rate changes   1,800,000 (1,200,000)  
Curtailments, net of taxes of $(19.5) in 2012 for pension benefits   (29,200,000)    
Settlements, net of taxes of $(10.6) in 2012 for pension benefits   (77,300,000)    
Benefits paid   (40,700,000) (41,600,000)  
Projected benefit obligation at December 31, 716,800,000 716,800,000 746,100,000 678,000,000
Change in plan assets        
Fair value of plan assets at January 1,   583,000,000 569,900,000  
Actual return on plan assets   59,000,000 9,200,000  
Employer contributions   7,600,000 46,600,000  
Foreign currency exchange rate changes   1,700,000 (1,100,000)  
Settlements   (62,600,000) 0  
Benefits paid   (40,700,000) (41,600,000)  
Fair value of plan assets at December 31, 548,000,000 548,000,000 583,000,000 569,900,000
Funded status of plan (168,800,000) (168,800,000) (163,100,000)  
Other Benefits
        
Change in projected benefit obligation        
Benefit obligation at January 1,   29,900,000 33,600,000  
Service cost   500,000 600,000 500,000
Interest cost   1,200,000 1,600,000 1,700,000
Plan participants' contributions   1,100,000 1,100,000  
Amendments   0 0  
Actuarial loss (gain)   (1,700,000) (3,000,000)  
Foreign currency exchange rate changes   0 0  
Curtailments, net of taxes of $(19.5) in 2012 for pension benefits   0 0  
Settlements, net of taxes of $(10.6) in 2012 for pension benefits   0 0  
Benefits paid   (3,700,000) (4,000,000)  
Projected benefit obligation at December 31, 27,300,000 27,300,000 29,900,000 33,600,000
Change in plan assets        
Fair value of plan assets at January 1,   19,300,000 18,900,000  
Actual return on plan assets   2,100,000 400,000  
Employer contributions   2,600,000 2,900,000  
Plan participants' contributions   1,100,000 1,100,000  
Foreign currency exchange rate changes   0 0  
Settlements   0 0  
Benefits paid   (3,700,000) (4,000,000)  
Fair value of plan assets at December 31, 21,400,000 21,400,000 19,300,000 18,900,000
Funded status of plan $ (5,900,000) $ (5,900,000) $ (10,600,000)