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Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Jul. 01, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ (1,244.1)	$ (1,244.1)	$ (1,630.1)	$ (1,326.5)	$ (1,647.4)
Reclassification pursuant to ASU No. 2018-02		0.0
Other comprehensive income before reclassifications				(34.2)
Amounts reclassified from accumulated other comprehensive income		38.5	46.1	115.8	119.0
Current period other comprehensive income				(127.1)
Ending balance		(1,203.8)	(1,649.9)	(1,203.8)	(1,649.9)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(3,765.2)	(3,765.2)	(4,067.4)	(3,815.8)	(4,152.8)
Reclassification pursuant to ASU No. 2018-02	$ (208.7)	(208.7)		(208.7)
Ending balance		(3,942.9)	$ (4,036.3)	(3,942.9)	$ (4,036.3)
Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance				(817.0)
Reclassification pursuant to ASU No. 2018-02				0.0
Other comprehensive income before reclassifications				(35.3)
Amounts reclassified from accumulated other comprehensive income				0.0
Current period other comprehensive income				(35.3)
Ending balance		(852.3)		(852.3)
Postretirement Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance				(2,998.8)
Reclassification pursuant to ASU No. 2018-02				(208.7)
Other comprehensive income before reclassifications				1.1
Amounts reclassified from accumulated other comprehensive income				115.8
Current period other comprehensive income				(91.8)
Ending balance		$ (3,090.6)		$ (3,090.6)

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Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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