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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance			$ (3,333.4)
Accumulated other comprehensive income (loss), Other comprehensive income before reclassifications			58.6
Accumulated other comprehensive income (loss), Amounts reclassified from accumulated other comprehensive income			107.5
Accumulated other comprehensive income (loss), Current period other comprehensive income			166.1
Accumulated other comprehensive income (loss), ending balance	(3,167.3)		(3,167.3)
Translation Adjustments, beginning balance			(676.8)
Translation Adjustments, Other comprehensive income before reclassifications			(17.9)
Translation Adjustments, Amounts reclassified from accumulated other comprehensive income
Translation Adjustments, Current period other comprehensive income			(17.9)
Translation Adjustments, ending balance	(694.7)		(694.7)
Postretirement Plans, beginning balance			(2,656.6)
Postretirement Plans, Other comprehensive income before reclassifications			76.5
Postretirement Plans, Amounts reclassified from accumulated other comprehensive income	35.6	47.1	107.5	139.2
Postretirement Plans, Current period other comprehensive income			184.0
Postretirement Plans, ending balance	$ (2,472.6)		$ (2,472.6)