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Leasing (Tables) | 3 Months Ended
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Mar. 31, 2019
Leasing [Abstract] |
Components of lease cost [Table Text Block] | Lease cost consists of the following:
|  | Three Months Ended
|  | March 31,
|  | 2019
|  | (in millions)
Finance lease cost |  |
Amortization of right-of-use assets |  | $ | 0.2 |
Interest on lease liabilities |  | 0.1 |
Total finance lease cost |  | 0.3 |
Operating lease cost |  | 6.7 |
Short-term lease cost |  | 1.7 |
Variable lease cost |  | 1.9 |
Total lease cost |  | $ | 10.6 |
Supplemental lease information [Table Text Block] | The following table summarizes additional information related to our lease agreements.
|  | Three Months Ended
|  | March 31,
|  | 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 |  | 6.9 |
Financing cash flows from finance leases |  | 0.2 |
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 |  | 8.2 | %
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 three months ended March 31, 2019) |  | $ | 0.8 |  |  | $ | 20.1 |
2020 |  | 1.1 |  |  | 24.5 |
2021 |  | 1.0 |  |  | 16.4 |
2022 |  | 0.8 |  |  | 12.8 |
2023 |  | — |  |  | 7.6 |
Thereafter |  | — |  |  | 19.0 |
Total future undiscounted minimum lease payments |  | 3.7 |  |  | 100.4 |
Less: Impact of discounting |  | (0.5 | ) |  | (16.6 | )
Total |  | $ | 3.2 |  |  | $ | 83.8 |
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 March 31, 2019 are as follows:
|  | Finance Leases |  | Operating Leases
|  | (in millions)
Property, plant and equipment |  | $ | 3.2 |  |  | $ | — |
Other assets and deferred charges |  | — |  |  | 84.1 |
Total |  | $ | 3.2 |  |  | $ | 84.1 |
Accrued expenses and other |  | $ | 0.9 |  |  | $ | 21.9 |
Postretirement benefits and other long-term liabilities |  | 2.3 |  |  | 61.9 |
Total |  | $ | 3.2 |  |  | $ | 83.8 |

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