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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2016
Financial Instruments And Guarantees With Off Balance Sheet Risk Disclosure [Abstract] |
Letters of credit, bank guarantees, surety bonds and corporate guarantees | As of December 31, 2016, the Company had the following financial instruments with off-balance-sheet risk:
| Reclamation Bonding Requirements |  | Coal Lease Obligations |  | Workers’ Compensation Obligations |  | Other(1) |  | Total (2) |  | Cash Collateral in Support of Financial Instruments
| (Dollars in millions)
Self bonding | $ | 1,094.2 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,094.2 |  |  | $ | — |
Surety bonds (3) | 319.6 |  |  | 94.0 |  |  | 19.1 |  |  | 15.5 |  |  | 448.2 |  |  | 64.5 |
Bank guarantees | 54.7 |  |  | — |  |  | — |  |  | 24.5 |  |  | 79.2 |  |  | 83.8 |
Other (4) | 233.2 |  |  | — |  |  | 42.7 |  |  | 118.0 |  |  | 393.9 |  |  | 233.2 |
Total | $ | 1,701.7 |  |  | $ | 94.0 |  |  | $ | 61.8 |  |  | $ | 158.0 |  |  | $ | 2,015.5 |  |  | $ | 381.5 |
(1) | Other includes the $37.0 million in letters of credit related to the PBGC, as described below, and an additional $121.0 million in bank guarantees, letters of credit and surety bonds related to road maintenance, performance guarantees and other operations.
(2) | Letters of credit held as collateral in support of surety bonds at December 31, 2016 were $48.0 million and are not reflected in the table above.
(3) | A total of $72.6 million of letters of credit issued as collateral to support surety bonds related to Patriot have been excluded from above as they no longer represent off-balance sheet obligations as discussed in Note 27. "Matters Related to the Bankruptcy of Patriot Coal Corporation".

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