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Inventories (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Finished goods	$ 176.2us-gaap_InventoryFinishedGoodsNetOfReserves	$ 268.2us-gaap_InventoryFinishedGoodsNetOfReserves
Raw materials and precious metals	88.0cvi_InventoryRawMaterialsAndPreciousMetalsNetOfReserves	177.0cvi_InventoryRawMaterialsAndPreciousMetalsNetOfReserves
In-process inventories	20.6us-gaap_InventoryWorkInProcessNetOfReserves	36.9us-gaap_InventoryWorkInProcessNetOfReserves
Parts and supplies	44.8us-gaap_InventoryPartsAndComponentsNetOfReserves	44.5us-gaap_InventoryPartsAndComponentsNetOfReserves
Inventories	329.6us-gaap_InventoryNet	526.6us-gaap_InventoryNet
Lower of FIFO cost or market inventory adjustment	$ 36.8us-gaap_InventoryWriteDown

X

- Definition

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process and precious metals.

+ References

No definition available.

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- Definition

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.6(a)(1))

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-Section S99

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- Definition

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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- Definition

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date for elements of machinery or equipment held for the purpose of replacing similar parts in the course of repair or maintenance.

+ References

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- Definition

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

+ References

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-Name Staff Accounting Bulletin (SAB)

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Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

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