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Components of Net Periodic Pension Cost (Detail) (Pension Plans, Defined Benefit, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension Plans, Defined Benefit
     
Pension and Other Postretirement Benefits Disclosure [Line Items]      
Service cost, net of employee contributions $ 29.9 $ 27.8 $ 26.1
Interest cost 18.3 19.5 19.0
Expected return on plan assets (26.0) (24.1) (23.2)
Amortization of net loss 14.1 11.0 8.4
Amortization of prior service cost (0.5) (0.4) (0.2)
Net periodic pension cost $ 35.8 $ 33.8 $ 30.1