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Retirement Plans and Other Post-Retirement Benefits - Schedule of Pension and Post Retirement Medical Benefit Plans (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
One-time settlement charge     $ 2.0
Pension Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 11.6 11.3 10.3
Interest cost 21.8 23.0 24.2
Expected return on plan assets (43.4) (42.2) (42.0)
Amortization of prior service cost/(credit) 3.1 2.5 2.6
Amortization of actuarial loss 21.1 17.0 13.3
One-time settlement charge       2.0
Total net periodic benefit cost 14.2 11.6 10.4
Other Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 2.9 2.8 2.9
Interest cost 2.1 2.4 2.8
Expected return on plan assets   (0.5) (0.5)
Amortization of prior service cost/(credit) (0.5) (0.9) (1.2)
Amortization of actuarial loss 0.6 0.7 0.9
Total net periodic benefit cost $ 5.1 $ 4.5 $ 4.9