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Non Operating Income and Expenses | 12 Months Ended
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Dec. 31, 2023
Other Income and Expenses [Abstract] |
Other Nonoperating Income and Expense | The major components of “Non-operating expense” in the Consolidated Statements of Operations are:
| Years Ended December 31,
| 2023 | 2022 | 2021
Interest expense | $ | (31.9) |  | $ | (34.3) |  | $ | (35.5) |
Capitalized interest | 0.8 |  | 0.2 |  | 0.3 |
Amortization of debt issuance costs | (1.3) |  | (1.5) |  | (1.8) |
Interest income | 2.4 |  | 1.0 |  | 0.6 |
Interest expense, net | (30.0) |  | (34.6) |  | (36.4) |
Debt retirement costs | (3.1) |  | (0.5) |  | (1.0) |
Non-operating pension and other postretirement employee benefits expense (income) | 0.1 |  | (5.7) |  | (10.4) |
Total non-operating expense | $ | (33.0) |  | $ | (40.9) |  | $ | (47.7) |

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- Definition The entire disclosure for the components of non-operating income or non-operating expense, including, but not limited to, amounts earned from dividends, interest on securities, gain (loss) on securities sold, equity earnings of unconsolidated affiliates, gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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