Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		1 Months Ended
Sep. 30, 2012	Dec. 31, 2011	Oct. 31, 2012 Subsequent Event
Changes in AROs
Obligation at beginning of the period	$ 131.6
Accretion expense	7.2
Liabilities incurred	0.9
Expenditures	(4.9)
Changes in estimates	(11.2)
Obligation at end of the period	123.6
Changes in estimate due to changes in mining and reclamation plans	11.2
Change of estimate recorded as a decrease to property, plant and equipment	6.2
Change of estimate charged to earnings	5.0
Current portion	11.0	13.8
Noncurrent portion	112.6	117.8
Total Asset Retirement Obligation	123.6
Expected deposits to be made into the escrow account for the benefit of the FDEP	4.0
Total balance in ARO trust	147.6	145.4
Asset Retirement Obligations
Deposits into trust			$ 53.0

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Amount of the increase or decrease in the amount of the asset retirement obligation capitalized during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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Amount of the increase or decrease in the amount of the asset retirement obligation charged to earnings during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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Represents the amount of the increase or decrease in the amount of the asset retirement obligation charged to earnings during the current period for changes in the amount or timing of the estimated cash flows associated with the changes in mining and reclamation plans.

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No definition available.

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Cash outflow made to a trust established for asset retirement obligations.

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Expected deposits to be made into the escrow account for the benefit of the Florida Department of Environmental Protection.

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Total balance in asset retirement obligation trust funds.

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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Amount of asset retirement obligations incurred during the period.

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

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Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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