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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, 2016	Dec. 31, 2015
U.S. Pension
Actuarial gains (losses) recognized:
Reclassification adjustments	$ 2.7	$ 2.6
Effect of settlement	33.2	0.0
Actuarial gain (loss) arising during the period	(10.1)	(0.4)
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	25.8	2.2
Foreign Pension
Actuarial gains (losses) recognized:
Reclassification adjustments	3.1	4.1
Effect of settlement	0.4	0.0
Actuarial gain (loss) arising during the period	(30.0)	7.3
Prior service credit recognized:
Reclassification adjustments	0.0	0.0
Translation adjustment	(1.0)	12.8
Other comprehensive (income) loss, pension and other postretirement benefit plans, adjustment, before tax, total	(27.5)	24.2
U.S. Other Postretirement
Actuarial gains (losses) recognized:
Reclassification adjustments	(1.3)	(1.2)
Effect of settlement	0.0	0.0
Actuarial gain (loss) arising during the period	12.8	3.1
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	11.5	1.9
Foreign Other Postretirement
Actuarial gains (losses) recognized:
Reclassification adjustments	0.2	0.5
Effect of settlement	0.0	0.0
Actuarial gain (loss) arising during the period	(0.8)	3.9
Prior service credit recognized:
Reclassification adjustments	(0.3)	(0.4)
Translation adjustment	(0.1)	1.2
Other comprehensive (income) loss, pension and other postretirement benefit plans, adjustment, before tax, total	$ (1.0)	$ 5.2

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- Definition

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

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Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans.

+ References

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Amount before tax of gain (loss) adjustment to other comprehensive income (loss) resulting from settlement or curtailment of defined benefit pension and other postretirement defined benefit plans.

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Amount before tax, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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Amount before tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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