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Postretirement Benefit Plans - Net Periodic Benefit Cost of Pension Plans and Other Employee Related Benefit Plans (Detail) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Pension [Member]
Sep. 30, 2011
Pension [Member]
Sep. 30, 2012
Pension [Member]
Sep. 30, 2011
Pension [Member]
Sep. 30, 2012
Others Benefits [Member]
Oct. 30, 2011
Others Benefits [Member]
Sep. 30, 2012
Others Benefits [Member]
Sep. 30, 2011
Others Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]                        
Service cost $ 2.0 $ 2.2 $ 5.9 $ 6.6 $ 1.5 $ 1.7 $ 4.3 $ 5.0 $ 0.5 $ 0.5 $ 1.6 $ 1.6
Interest cost 6.1 6.3 18.3 19.0 3.9 4.0 11.6 12.0 2.2 2.3 6.7 7.0
Expected return on plan assets (4.9) (4.8) (14.0) (14.4) (4.7) (4.7) (13.6) (14.0) (0.2) (0.1) (0.4) (0.4)
Amortization of prior service cost 0.2 0.3 0.6 0.8 0.2 0.3 0.7 0.9     (0.1) (0.1)
Amortization of net actuarial loss 2.7 1.5 7.8 4.5 1.6 0.9 4.7 2.6 1.1 0.6 3.1 1.9
Net periodic benefit cost $ 6.1 $ 5.5 $ 18.6 $ 16.5 $ 2.5 $ 2.2 $ 7.7 $ 6.5 $ 3.6 $ 3.3 $ 10.9 $ 10.0