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Pension and Other Postretirement Benefit Plans - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
CompensationPlan
yr
Agreement
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Services completed by employees for eligibility, retiring age | yr 55    
Accumulated benefit obligation $ 1,099.2 $ 1,192.7  
Projected benefit obligation of pension plans with accumulated benefit obligations in excess of plan assets 874.4 930.4  
Accumulated benefit obligation of pension plans with accumulated benefit obligations in excess of plan assets 859.5 912.5  
Fair value of plan assets of pension plans with accumulated benefit obligations in excess of plan assets 607.0 608.5  
Tax benefits (expense) related to defined benefit plans recognized in other comprehensive income (loss) (8.3) 56.5 $ (70.1)
Postretirement benefit obligation effect of 1% increase in the assumed rate of healthcare cost 16.0    
Net periodic postretirement benefit cost effect of 1% increase in the assumed rate of healthcare cost 1.0    
Postretirement benefit obligation effect of 1% decrease in the assumed rate of healthcare cost 13.2    
Net periodic postretirement benefit cost effect of 1% decrease in the assumed rate of healthcare cost $ 0.7    
Number of multi-employer pension plans | CompensationPlan 2    
Number of collective bargaining agreements | Agreement 3    
Defined contribution expense $ 13.3 12.0 11.1
Defined Contribution Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution expense 19.4 17.8 16.4
U.S. Other Postretirement      
Defined Benefit Plan Disclosure [Line Items]      
Settlement gain (loss) $ 0.0 0.0 0.0
Assumed increase in healthcare costs trend rate 6.70%    
Ultimate healthcare costs trend rate 4.50%    
Foreign Other Postretirement      
Defined Benefit Plan Disclosure [Line Items]      
Settlement gain (loss) $ 0.0 0.0 5.9
Assumed increase in healthcare costs trend rate 5.30%    
Ultimate healthcare costs trend rate 4.50%    
U.S. Pension      
Defined Benefit Plan Disclosure [Line Items]      
Curtailment loss $ 0.0 0.0 0.0
Settlement gain (loss) $ (0.2) (0.1) 0.0
U.S. Pension | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target percentage of asset allocation 50.00%    
Maximum target percentage of asset allocation 75.00%    
U.S. Pension | Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target percentage of asset allocation 15.00%    
Maximum target percentage of asset allocation 40.00%    
U.S. Pension | Alternative Investment Allocation      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target percentage of asset allocation 0.00%    
Maximum target percentage of asset allocation 30.00%    
U.S. Pension | Cash and other      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target percentage of asset allocation 0.00%    
Maximum target percentage of asset allocation 10.00%    
Foreign Pension      
Defined Benefit Plan Disclosure [Line Items]      
Curtailment loss $ (7.7) 0.0 0.0
Settlement gain (loss) $ 0.0 $ 0.0 $ (2.5)
Foreign Pension | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target percentage of asset allocation 45.00%    
Maximum target percentage of asset allocation 65.00%    
Foreign Pension | Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target percentage of asset allocation 30.00%    
Maximum target percentage of asset allocation 40.00%    
Foreign Pension | Alternative Investment Allocation      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target percentage of asset allocation 0.00%    
Maximum target percentage of asset allocation 20.00%    
Foreign Pension | Cash and other      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target percentage of asset allocation 0.00%    
Maximum target percentage of asset allocation 10.00%    
Pension Plans, Defined Benefit | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Estimated minimum required contributions to pension plans in next fiscal year $ 10.0    
Pension Plans, Defined Benefit | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Estimated minimum required contributions to pension plans in next fiscal year $ 15.0