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Reconciliation of Level Three Measurements (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]    
Beginning balance $ 63.8 $ 59.4
Actual return on assets related to assets still held 5.7 4.4
Purchases, sales and settlements (5.0)  
Ending balance 64.5 63.8
Group annuity/insurance contracts
    
Defined Benefit Plan Disclosure [Line Items]    
Beginning balance 20.6 20.0
Actual return on assets related to assets still held 0.6 0.6
Ending balance 21.2 20.6
Commingled Funds | Multi-strategy hedge funds
    
Defined Benefit Plan Disclosure [Line Items]    
Beginning balance 18.8 17.5
Actual return on assets related to assets still held 1.7 1.3
Ending balance 20.5 18.8
Commingled Funds | Real estate
    
Defined Benefit Plan Disclosure [Line Items]    
Beginning balance 24.4 21.9
Actual return on assets related to assets still held 3.4 2.5
Purchases, sales and settlements (5.0)  
Ending balance $ 22.8 $ 24.4