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Accumulated Other Comprehensive Income - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income (expense), net	$ (17.7)	$ (21.1)	[1]	$ (58.3)	$ (78.5)	[1]
Postretirement Plans:
Total reclassification for the period	38.5	46.1		115.8	119.0
Translation Adjustments
Postretirement Plans:
Total reclassification for the period				0.0
Postretirement Plans
Postretirement Plans:
Amortization of postretirement plan items, before tax	39.8	47.5		119.6	122.6
Income tax benefit	(1.3)	(1.4)		(3.8)	(3.6)
Total reclassification for the period				115.8
Amortization of prior service cost
Postretirement Plans:
Amortization of postretirement plan items, before tax	(1.7)	(1.3)		(5.3)	(4.1)
Amortization of actuarial losses
Postretirement Plans:
Amortization of postretirement plan items, before tax	41.5	43.1		124.9	131.3
Curtailment gain
Postretirement Plans:
Amortization of postretirement plan items, before tax	0.0	0.0		0.0	(5.2)
Adjustment for substantial completion of liquidation of foreign subsidiaries | Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income (expense), net	$ 0.0	$ 5.7		$ 0.0	$ 0.6
[1] Amounts were changed to conform to the current-year presentation. See Note 3.

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