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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Certain changes made in the current period to the value and amount of inventory reported.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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Significant Accounting Policies - Additional Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Significant Accounting Policies [Line Items]
Percentage of inventory determined using LIFO	20.00%us-gaap_PercentageOfLIFOInventory	17.00%us-gaap_PercentageOfLIFOInventory
Adjustments to reflect inventory at net realizable value	$ 8.3us-gaap_InventoryAdjustments	$ 10.1us-gaap_InventoryAdjustments
Research and development expenses	59.8us-gaap_ResearchAndDevelopmentExpense	61.8us-gaap_ResearchAndDevelopmentExpense	54.8us-gaap_ResearchAndDevelopmentExpense
Stock compensation expense	15.2us-gaap_StockOptionPlanExpense	15.5us-gaap_StockOptionPlanExpense	11.0us-gaap_StockOptionPlanExpense
Unvested Stock Options Fair Value
Significant Accounting Policies [Line Items]
Stock compensation expense	17.0	17.0	12.4
Selling, General and Administrative Expenses
Significant Accounting Policies [Line Items]
Stock compensation expense	15.4	15.5	11.0
Cost of Sales
Significant Accounting Policies [Line Items]
Stock compensation expense	$ 1.6	$ 1.5	$ 1.4
Minimum
Significant Accounting Policies [Line Items]
Intangible assets, estimated useful life (years)	3 years
Minimum \| Building and Building Improvements
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	9 years
Minimum \| Machinery and Equipment
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	3 years
Minimum \| Office Equipment
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	3 years
Maximum
Significant Accounting Policies [Line Items]
Intangible assets, estimated useful life (years)	20 years
Maximum \| Software
Significant Accounting Policies [Line Items]
Intangible assets, estimated useful life (years)	10 years
Maximum \| Building and Building Improvements
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	40 years
Maximum \| Machinery and Equipment
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	20 years
Maximum \| Office Equipment
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	10 years
Armand Products Company
Significant Accounting Policies [Line Items]
Percentage of ownership interest	50.00%	50.00%	50.00%
ArmaKleen Company
Significant Accounting Policies [Line Items]
Percentage of ownership interest	50.00%	50.00%	50.00%
Natronx Technologies LLC
Significant Accounting Policies [Line Items]
Percentage of ownership interest	33.33%	33.33%	33.33%