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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, 2017	Dec. 31, 2016
United States | Pension
Actuarial gains (losses) recognized
Reclassification adjustments	$ 2.6	$ 2.7
Actuarial gain (loss) arising during the period	11.4	(10.1)
Effect of curtailment	0.0	0.0
Effect of settlement	0.2	33.2
Prior service credit recognized
Reclassification adjustments	0.0	0.0
Translation adjustment	0.0	0.0
Other comprehensive (income) loss, pension and other postretirement benefit plans, adjustment, before tax, total	14.2	25.8
United States | Other Postretirement
Actuarial gains (losses) recognized
Reclassification adjustments	(2.6)	(1.3)
Actuarial gain (loss) arising during the period	4.5	12.8
Effect of curtailment	2.1	0.0
Effect of settlement	0.0	0.0
Prior service credit recognized
Reclassification adjustments	0.0	0.0
Translation adjustment	0.0	0.0
Other comprehensive (income) loss, pension and other postretirement benefit plans, adjustment, before tax, total	4.0	11.5
Foreign | Pension
Actuarial gains (losses) recognized
Reclassification adjustments	5.1	3.1
Actuarial gain (loss) arising during the period	(6.0)	(30.0)
Effect of curtailment	0.0	0.0
Effect of settlement	0.8	0.4
Prior service credit recognized
Reclassification adjustments	0.0	0.0
Translation adjustment	(8.2)	(1.0)
Other comprehensive (income) loss, pension and other postretirement benefit plans, adjustment, before tax, total	(8.3)	(27.5)
Foreign | Other Postretirement
Actuarial gains (losses) recognized
Reclassification adjustments	0.3	0.2
Actuarial gain (loss) arising during the period	0.7	(0.8)
Effect of curtailment	0.2	0.0
Effect of settlement	0.0	0.0
Prior service credit recognized
Reclassification adjustments	(0.4)	(0.3)
Translation adjustment	(0.4)	(0.1)
Other comprehensive (income) loss, pension and other postretirement benefit plans, adjustment, before tax, total	$ 0.4	$ (1.0)

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- Definition

The amount of increase or decrease in other defined benefit plan other comprehensive income attributed to foreign currency changes.

+ References

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- Definition

Other Comprehensive Income (Loss), Defined Benefit Plan, Curtailment Gain (Loss), before Tax

+ References

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- Definition

Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement, before Tax

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- Definition

Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580

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- Definition

Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
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-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580

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- Definition

Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580

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