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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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