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Pension and Other Postretirement Benefit Plans - Amounts Recorded in Accumulated Other Comprehensive Loss Not Yet Recognized in Net Periodic Benefit Cost (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
U.S. Pension    
Defined Benefit Plan Disclosure [Line Items]    
Net unrecognized actuarial gain (loss) $ (135.9) $ (138.1)
Prior service credit 0.0 0.0
Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), before tax, total (135.9) (138.1)
Foreign Pension    
Defined Benefit Plan Disclosure [Line Items]    
Net unrecognized actuarial gain (loss) (73.4) (97.6)
Prior service credit 0.0 0.0
Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), before tax, total (73.4) (97.6)
U.S. Other Postretirement    
Defined Benefit Plan Disclosure [Line Items]    
Net unrecognized actuarial gain (loss) 13.6 11.7
Prior service credit 0.0 0.0
Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), before tax, total 13.6 11.7
Foreign Other Postretirement    
Defined Benefit Plan Disclosure [Line Items]    
Net unrecognized actuarial gain (loss) (5.4) (11.3)
Prior service credit 1.2 1.9
Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), before tax, total $ (4.2) $ (9.4)