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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, 2018	Dec. 31, 2017
Pension | U.S.
Actuarial gains (losses) recognized:
Reclassification adjustments	$ 2.0	$ 2.6
Actuarial gain (loss) arising during the period	2.1	11.4
Effect of curtailment	0.0	0.0
Effect of settlements	5.7	0.2
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	9.8	14.2
Pension | Foreign
Actuarial gains (losses) recognized:
Reclassification adjustments	6.2	5.1
Actuarial gain (loss) arising during the period	(11.2)	(6.0)
Effect of curtailment	0.0	0.0
Effect of settlements	0.0	0.8
Prior service credit recognized:
Reclassification adjustments	0.0	0.0
Prior service cost arising during the period	(0.6)	0.0
Translation adjustment	7.4	(8.2)
Pretax amounts recognized in other comprehensive (income) loss	1.8	(8.3)
Other Postretirement | U.S.
Actuarial gains (losses) recognized:
Reclassification adjustments	(2.2)	(2.6)
Actuarial gain (loss) arising during the period	1.8	4.5
Effect of curtailment	0.0	2.1
Effect of settlements	0.0	0.0
Prior service credit recognized:
Reclassification adjustments	(0.2)	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	(0.6)	4.0
Other Postretirement | Foreign
Actuarial gains (losses) recognized:
Reclassification adjustments	0.2	0.3
Actuarial gain (loss) arising during the period	3.9	0.7
Effect of curtailment	0.0	0.2
Effect of settlements	0.0	0.0
Prior service credit recognized:
Reclassification adjustments	(0.3)	(0.4)
Prior service cost arising during the period	0.0	0.0
Translation adjustment	0.4	(0.4)
Pretax amounts recognized in other comprehensive (income) loss	$ 4.2	$ 0.4

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Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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