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Leasing (Tables) | 6 Months Ended
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Jun. 30, 2019
Leasing [Abstract] |
Components of lease cost [Table Text Block] | Lease cost consists of the following:
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2019 |  | 2019
|  | (in millions)
Finance lease cost |  |  |  |
Amortization of right-of-use assets |  | $ | 0.2 |  |  | $ | 0.4 |
Interest on lease liabilities |  | — |  |  | 0.1 |
Total finance lease cost |  | 0.2 |  |  | 0.5 |
Operating lease cost |  | 6.7 |  |  | 13.4 |
Short-term lease cost |  | 1.7 |  |  | 3.4 |
Variable lease cost |  | 2.3 |  |  | 4.2 |
Total lease cost |  | $ | 10.9 |  |  | $ | 21.5 |
Supplemental lease information [Table Text Block] | The following table summarizes additional information related to our lease agreements.
|  | Six Months Ended
|  | June 30,
|  | 2019
|  | (in millions, except lease term and rate)
Cash paid for amounts included in measurement of lease liabilities |  |
Operating cash flows from finance leases |  | $ | 0.1 |
Operating cash flows from operating leases |  | 13.6 |
Financing cash flows from finance leases |  | 0.4 |
Weighted-average remaining lease term - finance leases |  | 3.1 years |
Weighted-average remaining lease term - operating leases |  | 5.1 years |
Weighted-average discount rate - finance leases |  | 8.1 | %
Weighted-average discount rate - operating leases |  | 6.3 | %
Future minimum lease payments [Table Text Block] | Future undiscounted minimum payments under non-cancelable leases are as follows:
|  | Finance Leases |  | Operating Leases
|  | (in millions)
2019 (excluding the six months ended June 30, 2019) |  | $ | 0.5 |  |  | $ | 13.0 |
2020 |  | 1.1 |  |  | 24.0 |
2021 |  | 1.0 |  |  | 16.8 |
2022 |  | 0.9 |  |  | 12.8 |
2023 |  | 0.9 |  |  | 7.9 |
Thereafter |  | — |  |  | 19.0 |
Total future undiscounted minimum lease payments |  | 4.4 |  |  | 93.5 |
Less: Impact of discounting |  | (1.4 | ) |  | (14.1 | )
Total |  | $ | 3.0 |  |  | $ | 79.4 |
Right of use assets and lease liabilities [Table Text Block] | The right-of-use assets and lease liabilities recorded on our Condensed Consolidated Balance Sheet as of June 30, 2019 are as follows:
|  | Finance Leases |  | Operating Leases
|  | (in millions)
Property, plant and equipment, net |  | $ | 3.0 |  |  | $ | — |
Other assets and deferred charges |  | — |  |  | 79.4 |
Total |  | $ | 3.0 |  |  | $ | 79.4 |
Accrued expenses and other |  | $ | 0.8 |  |  | $ | 22.0 |
Postretirement benefits and other long-term liabilities |  | 2.2 |  |  | 57.4 |
Total |  | $ | 3.0 |  |  | $ | 79.4 |

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