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Accounting for Asset Retirement Obligations Other Commitments (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Commitments [Line Items]
Surety Bonds Outstanding Delivered To EPA	$ 233.7
Restricted cash	15.8	$ 32.6	$ 31.3
Asset retirement obligations	1,023.8	761.2
Bonnie Facility Trust [Member]
Other Commitments [Line Items]
Assets held-in-trust, current		21.0
Plant City and Bonnie Facilities [Member]
Other Commitments [Line Items]
Asset retirement obligations	$ 109.2	$ 97.7

X

- Definition

The face amount of surety bonds provided by the entity as of the balance sheet date, which were issued to provide assurance to EPA in connection with mining reclamation obligations.

+ References

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- Definition

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.

+ References

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The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate within one year of the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.

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