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Leasing (Tables) | 12 Months Ended
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Dec. 31, 2023
Leases [Abstract] |
Components of lease cost [Table Text Block] | Lease cost consists of the following:
|  | Twelve Months Ended |  |  |  |
|  | December 31, |  |  |  |
|  | 2023 |  | 2022 |  | 2021 |  |  |  |
|  | (in millions) |  |  |  |
Finance lease cost |  |  |  |  |  |  |  |  |  |
Amortization of right-of-use assets |  | $ | 12.3 |  |  | $ | 9.9 |  |  | $ | 4.2 |  |  |  |  |
Interest on lease liabilities |  | 5.1 |  |  | 4.7 |  |  | 2.0 |  |  |  |  |
Total finance lease cost |  | 17.4 |  |  | 14.6 |  |  | 6.2 |  |  |  |  |
Operating lease cost |  | 30.9 |  |  | 32.6 |  |  | 33.3 |  |  |  |  |
Short-term lease cost |  | 2.1 |  |  | 1.4 |  |  | 1.6 |  |  |  |  |
Variable lease cost |  | 5.8 |  |  | 5.6 |  |  | 3.2 |  |  |  |  |
Total lease cost |  | $ | 56.2 |  |  | $ | 54.2 |  |  | $ | 44.3 |  |  |  |  |
Supplemental lease information [Table Text Block] | The following table summarizes additional information related to our lease agreements.
|  | Twelve Months Ended |  |
|  | December 31, |  |
|  | 2023 |  | 2022 |  | 2021 |  |  |  |
|  | (in millions, except lease term and rate) |  |  |  |
Cash paid for amounts included in measurement of lease liabilities |  |  |  |  |  |  |  |  |  |
Operating cash flows from finance leases |  | $ | 5.1 |  | $ | 4.7 |  | $ | 2.0 |  |  |  |
Operating cash flows from operating leases |  | 36.1 |  | 37.6 |  | 35.9 |  |  |  |
Financing cash flows from finance leases |  | 13.7 |  | 11.2 |  | 5.0 |  |  |  |
Weighted-average remaining lease term - finance leases |  | 12.7 years |  | 13.1 years |  | 16.4 years |  |  |  |
Weighted-average remaining lease term - operating leases |  | 7.9 years |  | 8.4 years |  | 8.6 years |  |  |  |
Weighted-average discount rate - finance leases |  | 5.0 | % |  | 4.9 | % |  | 4.8 | % |  |  |  |
Weighted-average discount rate - operating leases |  | 6.4 | % |  | 5.4 | % |  | 5.2 | % |  |  |  |
Future minimum lease payments [Table Text Block] | Future undiscounted minimum payments under non-cancelable leases are as follows:
|  | Finance Leases |  | Operating Leases
|  | (in millions)
2024 |  | $ | 15.8 |  |  | $ | 28.7 |
2025 |  | 12.9 |  |  | 24.1 |
2026 |  | 11.5 |  |  | 17.7 |
2027 |  | 9.6 |  |  | 13.6 |
2028 |  | 8.3 |  |  | 10.6 |
Thereafter |  | 73.2 |  |  | 54.4 |
Total future undiscounted minimum lease payments |  | 131.3 |  |  | 149.1 |
Less: Impact of discounting |  | (32.8) |  |  | (31.7) |
Total |  | $ | 98.5 |  |  | $ | 117.4 |
Right of use assets and lease liabilities [Table Text Block] | The right-of-use assets and lease liabilities recorded on our Consolidated Balance Sheets are as follows:
| December 31, 2023 |  | December 31, 2022
| Finance Leases |  | Operating Leases |  | Finance Leases |  | Operating Leases
| (in millions) |  | (in millions)
Property, plant and equipment, net | $ | 102.4 |  |  | $ | — |  |  | $ | 106.2 |  |  | $ | — |
Operating lease right-of-use assets | — |  |  | 115.6 |  |  | — |  |  | 107.2 |
Total | $ | 102.4 |  |  | $ | 115.6 |  |  | $ | 106.2 |  |  | $ | 107.2 |
Current portion of operating lease liabilities | $ | — |  |  | $ | 21.9 |  |  | $ | — |  |  | $ | 21.1 |
Accrued expenses and other | 11.2 |  |  | — |  |  | 13.0 |  |  | — |
Long-term portion of operating lease liabilities | — |  |  | 95.5 |  |  | — |  |  | 87.2 |
Postretirement benefits and other long-term liabilities | 87.3 |  |  | — |  |  | 92.4 |  |  | — |
Total | $ | 98.5 |  |  | $ | 117.4 |  |  | $ | 105.4 |  |  | $ | 108.3 |

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