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Leases (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Future minimum lease and royalty payments |  |  |
Capital Leases, 2017 | $ 7.3 |  |
Capital Leases, 2018 | 8.9 |  |
Capital Leases, 2019 | 0.5 |  |
Capital Leases, 2020 | 0.5 |  |
Capital Leases, 2021 | 0.5 |  |
Capital Leases, 2022 and Thereafter | 9.6 |  |
Capital Leases, Total minimum lease payments | 27.3 |  |
Capital Leases, Less interest | 7.6 |  |
Capital Leases, Present value of minimum capital lease payments | 19.7 |  |
Operating Leases, 2017 | 148.7 |  |
Operating Leases, 2018 | 100.4 |  |
Operating Leases, 2019 | 60.2 |  |
Operating Leases, 2020 | 26.4 |  |
Operating Leases, 2021 | 10.6 |  |
Operating Leases, 2022 and thereafter | 26.6 |  |
Operating Leases, Total minimum lease payments | 372.9 |  |
Coal Lease and Royalty Obligation, 2017 | 6.1 |  |
Coal Lease and Royalty Obligation, 2018 | 5.7 |  |
Coal Lease and Royalty Obligation, 2019 | 5.2 |  |
Coal Lease and Royalty Obligation, 2020 | 4.9 |  |
Coal Lease and Royalty Obligation, 2021 | 5.3 |  |
Coal Lease and Royalty Obligation, 2022 and Thereafter | 26.6 |  |
Coal Lease and Royalty Obligation, Total minimum lease payments | 53.8 |  |
Leases (Textuals) |  |  |
Rental expense under operating leases | 264.7 | $ 290.1 | $ 306.0
Contingent lease expense | 0.0 | 0.0 | 0.0
Property, plant, equipment and mine development assets, gross value under capital leases | 77.9 | 77.5 |
Accumulated depreciation of property, plant, equipment and mine development assets under capital leases | 48.6 | 32.2 |
Total royalty expenses on coal reserve leases | $ 389.7 | $ 444.5 | $ 507.8
Initial lease term for federal leases | ten years |  |
Minimum annual production on federal leases | 1.00% |  |
Monthly royalty percentage on federal leases for coal sales using surface mining methods | 12.50% |  |
Monthly royalty percentage on federal leases for coal production using underground mining methods | 8.00% |  |
Period to redetermine royalty rates on leased coal reserves in Arizona | every ten years |  |
Company's lease obligations secured by outstanding surety bonds | $ 94.0 |  |

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- Definition Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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