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Components of Net Periodic Benefit Expense (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Pension Plans
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1.9 $ 2.6 $ 4.3 $ 5.2
Interest cost 92.3 81.2 184.6 162.3
Expected return on assets (112.9) (107.4) (225.6) (215.4)
Amortization of prior service cost (0.3) (0.3) (0.6) (0.4)
Recognized net actuarial loss 37.5 46.7 75.3 94.3
Curtailment gain (0.6)   (0.6)  
Net periodic pension expense 17.9 22.8 37.4 46.0
U.S. Plans
        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 62.2 55.0 124.7 109.8
Expected return on assets (72.0) (72.7) (144.0) (145.7)
Amortization of prior service cost 0.2 0.1 0.4 0.3
Recognized net actuarial loss 27.0 34.1 54.8 69.0
Net periodic pension expense 17.4 16.5 35.9 33.4
International Plans
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1.9 2.6 4.3 5.2
Interest cost 30.1 26.2 59.9 52.5
Expected return on assets (40.9) (34.7) (81.6) (69.7)
Amortization of prior service cost (0.5) (0.4) (1.0) (0.7)
Recognized net actuarial loss 10.5 12.6 20.5 25.3
Curtailment gain (0.6)   (0.6)  
Net periodic pension expense 0.5 6.3 1.5 12.6
Other Postretirement Benefit Plans
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.1 0.2 0.3 0.3
Interest cost 2.0 2.0 4.0 4.0
Expected return on assets (0.2) (0.1) (0.3) (0.2)
Amortization of prior service cost 0.5 0.5 0.9 0.9
Recognized net actuarial loss 0.9 1.3 1.7 2.7
Net periodic pension expense $ 3.3 $ 3.9 $ 6.6 $ 7.7