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Summary of Changes in Benefit Obligations and Fair Value of Plan Assets for Post-Retirement Plans (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Pension and Other Retirement Benefits Expected Benefit Payments [Line Items]      
Ending Balance $ 167.6 $ 133.0  
Pension and retirement benefits liability-current (4.4) (3.8)  
Pension and retirement benefits liability-non current (213.3) (187.5)  
Pension Plans
     
Schedule of Pension and Other Retirement Benefits Expected Benefit Payments [Line Items]      
Benefit obligation, beginning of the period (298.8) (242.5)  
Service cost (18.9) (15.1) (13.5)
Interest cost (13.1) (13.1) (12.0)
Benefits paid 5.7 13.6  
Actuarial gain (loss) (11.0) (4.9)  
Assumption changes (20.2) (36.8)  
Benefit obligation, end of the period (356.3) (298.8) (242.5)
Beginning Balance 133.0 120.4  
Actual return on plan assets 19.0 0.8  
Benefits paid (5.7) (13.6)  
Employer contributions 21.3 25.4  
Ending Balance 167.6 133.0 120.4
Funded status of the plans (188.7) (165.8)  
Pension and retirement benefits liability-current (3.6) (3.0)  
Pension and retirement benefits liability-non current (185.1) (162.8)  
Net amount recognized (188.7) (165.8)  
Accumulated benefit obligation, end of the period (298.4) (256.1)  
Other Retirement Plans
     
Schedule of Pension and Other Retirement Benefits Expected Benefit Payments [Line Items]      
Benefit obligation, beginning of the period (20.2) (15.6)  
Service cost (1.5) (1.1) (0.9)
Interest cost (0.7) (0.8) (0.8)
Plan participants' contributions (0.3) (0.2)  
Benefits paid 1.0 0.8  
Actuarial gain (loss) 1.1 (0.9)  
Assumption changes (1.2) (2.4)  
Benefit obligation, end of the period (21.8) (20.2) (15.6)
Benefits paid (1.0) (0.8)  
Employer contributions 0.7 0.6  
Plan participants' contributions 0.3 0.2  
Funded status of the plans (21.8) (20.2)  
Pension and retirement benefits liability-current (0.8) (0.8)  
Pension and retirement benefits liability-non current (21.0) (19.4)  
Net amount recognized $ (21.8) $ (20.2)