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Non-operating Income (Expense) (Notes) | 6 Months Ended
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Jun. 30, 2022
Nonoperating Income (Expense) [Abstract] |
Other Nonoperating Income and Expense [Text Block] | Non-Operating Expense The components of “Non-operating expense” in the Consolidated Statements of Operations for the quarter and six months ended June 30, 2022 and 2021 are reflected in the table below:
| Quarter Ended June 30, |  | Six Months Ended June 30,
| 2022 | 2021 |  | 2022 | 2021
Interest expense | $ | (10.4) |  | $ | (9.1) |  |  | $ | (18.6) |  | $ | (18.2) |
Amortization of debt issuance costs | (0.4) |  | (0.5) |  |  | (0.8) |  | (0.9) |
Interest income | 0.1 |  | 0.2 |  |  | 0.1 |  | 0.6 |
Interest expense, net | (10.7) |  | (9.3) |  |  | (19.3) |  | (18.6) |
Debt retirement costs | (0.3) |  | — |  |  | (0.5) |  | — |
Non-operating pension and other postretirement employee benefits expense | (1.4) |  | (2.5) |  |  | (2.8) |  | (5.0) |
Total non-operating expense | $ | (12.4) |  | $ | (11.8) |  |  | $ | (22.7) |  | $ | (23.6) |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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