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Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Advance royalty recoupment reserve [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts |  |  |  |  |  |
Balance at Beginning of Period | $ 8.3 |  | $ 7.6 |  | $ 9.7 |
Charged to Costs and Expenses | 0.5 |  | 0.0 |  | (0.2) |
Deductions | (1.0) | [1] | (0.9) | [2] | (1.9) | [3]
Other | 0.0 |  | 1.6 | [2] | 0.0 |
Balance at End of Period | 7.8 |  | 8.3 |  | 7.6 |
Reserve for materials and supplies [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts |  |  |  |  |  |
Balance at Beginning of Period | 4.7 |  | 4.6 |  | 7.4 |
Charged to Costs and Expenses | 4.3 |  | 0.4 |  | (0.1) |
Deductions | (3.4) |  | (0.3) |  | (2.7) |
Other | 0.0 |  | 0.0 |  | 0.0 |
Balance at End of Period | 5.6 |  | 4.7 |  | 4.6 |
Allowance for doubtful accounts [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts |  |  |  |  |  |
Balance at Beginning of Period | 6.6 |  | 5.8 |  | 7.4 |
Charged to Costs and Expenses | 7.9 |  | 8.0 |  | 1.5 |
Deductions | (1.4) |  | (7.2) |  | (1.4) |
Other | 0.0 |  | 0.0 |  | (1.7) | [4]
Balance at End of Period | 13.1 |  | 6.6 |  | 5.8 |
Tax valuation allowances [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts |  |  |  |  |  |
Balance at Beginning of Period | 1,614.1 |  | 1,366.5 |  | 1,885.4 |
Charged to Costs and Expenses | 2,453.9 |  | 452.9 |  | 534.7 |
Deductions | 0.0 |  | 0.0 |  | 0.0 |
Other | (30.5) | [3] | (205.3) | [3] | (1,053.6) | [5],[6]
Balance at End of Period | $ 4,037.5 |  | $ 1,614.1 |  | $ 1,366.5 |
[1] | Reserves utilized, unless otherwise indicated.
[2] | Deductions to advance royalty recoupment reserve represents the termination of federal and state leases.
[3] | Includes the write-off of valuation allowance against deferred tax assets related to the Australian Minerals and Resource Rent Tax (MRRT) due to the repeal of that legislation in 2014, along with an increase in valuation allowance during the period reflected directly in "Accumulated other comprehensive loss" and the impact of the 2014 decrease in Australian dollar exchange rates.
[4] | Includes the impact of the decrease in Australian dollar exchange rates.
[5] | Balances transferred from other accounts.
[6] | Represents subsequent recovery of receivable amounts previously reserved.

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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