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Pension and Other Postretirement Benefit Plans - Amounts Recognized in Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Pension | U.S.    
Actuarial gains (losses) recognized:    
Reclassification adjustments $ 1.8 $ 2.0
Actuarial gain (loss) arising during the period (21.7) 2.1
Effect of curtailment 0.0 0.0
Effect of settlements 0.1 5.7
Prior service credit recognized:    
Reclassification adjustments 0.0 0.0
Prior service cost arising during the period 0.0 0.0
Translation adjustment 0.0 0.0
Pretax amounts recognized in other comprehensive (income) loss (19.8) 9.8
Pension | Foreign    
Actuarial gains (losses) recognized:    
Reclassification adjustments 7.8 6.2
Actuarial gain (loss) arising during the period (33.8) (11.2)
Effect of curtailment 0.1 0.0
Effect of settlements 0.0 0.0
Prior service credit recognized:    
Reclassification adjustments 0.0 0.0
Prior service cost arising during the period 0.0 (0.6)
Translation adjustment (3.8) 7.4
Pretax amounts recognized in other comprehensive (income) loss (29.7) 1.8
Other Postretirement | U.S.    
Actuarial gains (losses) recognized:    
Reclassification adjustments (2.3) (2.2)
Actuarial gain (loss) arising during the period (4.5) 1.8
Effect of curtailment 0.0 0.0
Effect of settlements 0.0 0.0
Prior service credit recognized:    
Reclassification adjustments (0.2) (0.2)
Prior service cost arising during the period 0.0 0.0
Translation adjustment 0.0 0.0
Pretax amounts recognized in other comprehensive (income) loss (7.0) (0.6)
Other Postretirement | Foreign    
Actuarial gains (losses) recognized:    
Reclassification adjustments 0.0 0.2
Actuarial gain (loss) arising during the period 0.0 3.9
Effect of curtailment 0.0 0.0
Effect of settlements 0.0 0.0
Prior service credit recognized:    
Reclassification adjustments (0.2) (0.3)
Prior service cost arising during the period 0.0 0.0
Translation adjustment 0.0 0.4
Pretax amounts recognized in other comprehensive (income) loss $ (0.2) $ 4.2