Schedule Of Significant Deferred Tax Assets And Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Deferred Tax Assets and Liabilities [Line Items]
Pension and other postretirement benefit plan liabilities	$ 524.1	$ 489.3
Net operating losses and other tax carryforwards	331.6	339.3
Accrued liabilities	155.2	178.5
Other	99.4	81.8
Total deferred tax assets	1,110.3	1,088.9
Valuation allowances	(273.6)	(273.2)
Net deferred tax assets	836.7	815.7
Accelerated depreciation	(226.3)	(257.7)
Other intangible assets	(98.6)	(212.5)
Inventories	(30.7)	(47.1)
Other	(30.2)	(22.5)
Total deferred tax liabilities	(385.8)	(539.8)
Net deferred tax assets	$ 450.9	$ 275.9