Annual report pursuant to Section 13 and 15(d)

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, 2011
Dec. 31, 2010
Dec. 31, 2009
Amounts recognized in net periodic benefit cost during the period:      
Total recognized in other comprehensive income $ (59.0) $ (25.1) $ (7.7)
Pension Benefits
      
Amounts arising during the period:      
Net actuarial loss (gain), net of taxes of $39.2 and $17.2 in 2011 and 2010, respectively, for pension benefits and $(0.6) and $0.4 in 2011 and 2010, respectively, for other benefits 68.9 31.0  
Foreign currency exchange rate (gain) loss, net of taxes of $(0.0) and $(0.1) in 2011 and 2010, respectively, for pension benefits (0.1) (0.1)  
Prior service (credit) cost, net of taxes of $0.2 for pension benefits in 2010   0.4  
Amounts recognized in net periodic benefit cost during the period:      
Recognized actuarial loss, net of taxes of $(4.4) and $(3.4) in 2011 and 2010, respectively, for pension benefits and $(0.5) and $(0.4) in 2011 and 2010, respectively, for other benefits (7.6) (5.8)  
Amortization of prior service cost, net of taxes of $(0.3) in 2011 and 2010 for pension benefits and $0.1 in 2011 and 2010 for other benefits (0.5) (0.5)  
Total recognized in other comprehensive income 60.7 25.0  
Other Benefits
      
Amounts arising during the period:      
Net actuarial loss (gain), net of taxes of $39.2 and $17.2 in 2011 and 2010, respectively, for pension benefits and $(0.6) and $0.4 in 2011 and 2010, respectively, for other benefits (1.0) 0.8  
Amounts recognized in net periodic benefit cost during the period:      
Recognized actuarial loss, net of taxes of $(4.4) and $(3.4) in 2011 and 2010, respectively, for pension benefits and $(0.5) and $(0.4) in 2011 and 2010, respectively, for other benefits (0.8) (0.8)  
Amortization of prior service cost, net of taxes of $(0.3) in 2011 and 2010 for pension benefits and $0.1 in 2011 and 2010 for other benefits 0.1 0.1  
Total recognized in other comprehensive income $ (1.7) $ 0.1