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Long-Term Debt and Capital Lease Obligations (Tables) | 12 Months Ended
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Dec. 31, 2017
Long-term Debt and Capital Lease Obligations [Abstract] |
Long-term debt outstanding maturities and sinking fund requirements | The following table shows the future maturities of our long-term debt outstanding (excluding obligations under capital leases) as of December 31, 2017:
(in millions) |  | Payments
2018 |  | $ | 838.4 |
2019 |  | 360.1 |
2020 |  | 686.9 |
2021 |  | 338.8 |
2022 |  | 40.7 |
Thereafter |  | 7,336.0 |
Total |  | $ | 9,600.9 |
Summary of capitalized leased facilities | The following is a summary of our capitalized leased facilities as of December 31:
(in millions) |  | 2017 |  | 2016
Long-term power purchase commitment |  | $ | 140.3 |  |  | $ | 140.3 |
Accumulated amortization |  | (115.2 | ) |  | (109.5 | )
Total leased facilities |  | $ | 25.1 |  |  | $ | 30.8 |
Future minimum lease payments under capital lease and present value of net minimum lease payments | Future minimum lease payments under our capital lease and the present value of our net minimum lease payments as of December 31, 2017 are as follows:
(in millions) |  | Payments
2018 |  | $ | 14.7 |
2019 |  | 15.5 |
2020 |  | 16.4 |
2021 |  | 17.2 |
2022 |  | 7.6 |
Thereafter |  | — |
Total minimum lease payments |  | 71.4 |
Less: Estimated executory costs |  | (33.1 | )
Net minimum lease payments |  | 38.3 |
Less: Interest |  | (11.3 | )
Present value of net minimum lease payments |  | 27.0 |
Less: Due currently |  | (3.7 | )
Long-term obligations under capital lease |  | $ | 23.3 |

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- Definition The entire disclosure for capital leasing arrangements including, but not limited to, the following: a) the basis on which contingent rental payments are determined; (b) the existence and terms of renewal or purchase options and escalation clauses; (c) restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -URI http://asc.fasb.org/subtopic&trid=2209026 + Details
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