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Amounts Recognized in Other Comprehensive Income (Loss) (Detail)

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Amounts Recognized in Other Comprehensive Income (Loss) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Amounts recognized in net periodic benefit cost during the period:      
Total recognized in other comprehensive income $ (23.9) $ 59.0 $ 25.1
Pension Benefits [Member]
      
Amounts arising during the period:      
Net actuarial loss (gain), net of taxes of $21.8 and $39.2 in 2012 and 2011, respectively, for pension benefits and $(0.8) and $(0.6) in 2012 and 2011, respectively, for other benefits 36.2 68.9  
Foreign currency exchange rate (gain) loss, net of taxes of $0.0 and $(0.0) in 2012 and 2011, respectively, for pension benefits 0.1 (0.1)  
Prior service (credit) cost, net of taxes of $2.8 for pension benefits in 2012 4.7     
Amounts recognized in net periodic benefit cost during the period:      
Recognized actuarial loss, net of taxes of $(5.9) and $(4.4) in 2012 and 2011, respectively, for pension benefits and $(0.4) and $(0.5) in 2012 and 2011, respectively, for other benefits (10.1) (7.6)  
Amortization of prior service cost, net of taxes of $(0.3) in 2012 and 2011 for pension benefits and $0.1 in 2012 and 2011 for other benefits (0.5) (0.5)  
Curtailments, net of taxes of $(10.6) in 2012 for pension benefits (18.4)     
Settlements, net of taxes of $(19.5) in 2012 for pension benefits (33.5)     
Total recognized in other comprehensive income (21.5) 60.7  
Other Benefits [Member]
      
Amounts arising during the period:      
Net actuarial loss (gain), net of taxes of $21.8 and $39.2 in 2012 and 2011, respectively, for pension benefits and $(0.8) and $(0.6) in 2012 and 2011, respectively, for other benefits (1.8) (1.0)  
Prior service (credit) cost, net of taxes of $2.8 for pension benefits in 2012        
Amounts recognized in net periodic benefit cost during the period:      
Recognized actuarial loss, net of taxes of $(5.9) and $(4.4) in 2012 and 2011, respectively, for pension benefits and $(0.4) and $(0.5) in 2012 and 2011, respectively, for other benefits (0.7) (0.8)  
Amortization of prior service cost, net of taxes of $(0.3) in 2012 and 2011 for pension benefits and $0.1 in 2012 and 2011 for other benefits 0.1 0.1  
Curtailments, net of taxes of $(10.6) in 2012 for pension benefits        
Settlements, net of taxes of $(19.5) in 2012 for pension benefits        
Total recognized in other comprehensive income $ (2.4) $ (1.7)