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Asset Retirement Obligations (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
Balance at beginning of period | $ 752.3 | $ 750.2
Liabilities settled or disposed | (38.4) | (47.7)
Accretion expense | 56.0 | 54.1
Revisions to estimates | (41.7) | (4.3)
Balance at end of period | 728.2 | 752.3
Less: Current portion (included in “Accounts payable and accrued expenses”) | 77.7 | 98.2
Asset retirement obligations | 650.5 | 654.1
Balance at end of period — active locations | 471.8 | 525.4
Balance at end of period — closed or inactive locations | 256.4 | 226.9
Surety bonds and bank guarantees outstanding to secure reclamation obligations or activities | 1,451.9 | 1,401.7
Letters of credit in support of reclamation obligations or activities | $ 315.0 | $ 106.1
Maximum |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
Life of mine | 20 years |
Minimum |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
Life of mine | 3 years |
LOM 3 Years or Less |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
Credit adjusted risk free interest rates | 9.16% | 9.24%
LOM Greater than 20 Years |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
Credit adjusted risk free interest rates | 12.74% | 12.38%

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- Definition Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6394232&loc=d3e17558-110866 + Details
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- Definition 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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