Schedule of Corporate Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 527.9	$ 1,028.4	$ 430.7	$ 449.7
Current and deferred income tax assets, net of valuation allowances	670.5us-gaap_DeferredTaxAssetsNet	471.4us-gaap_DeferredTaxAssetsNet
Property, plant and equipment, net	1,515.5us-gaap_PropertyPlantAndEquipmentNet	1,430.1us-gaap_PropertyPlantAndEquipmentNet
LIFO reserve	(93.6)us-gaap_InventoryLIFOReserve	(92.0)us-gaap_InventoryLIFOReserve
Corporate
Segment Reporting Information [Line Items]
Cash and cash equivalents	94.6	494.9	(137.2)
Current and deferred income tax assets, net of valuation allowances	152.0	39.2	324.5
Deferred compensation plan assets and Company owned life insurance assets	86.0	79.5	70.1
Software, net	82.1	71.1	71.8
Property, plant and equipment, net	61.2	61.7	60.7
Debt issuance costs	46.9	46.0	37.8
LIFO reserve	$ (93.6)	$ (92.0)	$ (92.1)

Deferred compensation plan assets and company owned life insurance assets.

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The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount of difference between inventory at lower of LIFO cost or market and inventory at lower of other inventory accounting method cost or market, for example, but not limited to, FIFO or average cost.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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