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Accumulated Other Comprehensive Loss (Notes) | 9 Months Ended
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Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | ACCUMULATED OTHER COMPREHENSIVE LOSS Accumulated other comprehensive loss, net of tax, is comprised of the following:
| Pension Plan Adjustments | Other Post Retirement Employee Benefit Plan Adjustments | Total
Balance at December 31, 2019 | $ | (67.8) |  | $ | 8.3 |  | $ | (59.5) |
Amounts reclassified from accumulated other comprehensive loss | 5.5 |  | — |  | 5.5 |
Balance at September 30, 2020 | $ | (62.4) |  | $ | 8.3 |  | $ | (54.0) |
Balance at December 31, 2020 | $ | (54.5) |  | $ | 0.2 |  | $ | (54.3) |
Other comprehensive loss before reclassifications | — |  | (2.8) |  | (2.8) |
Amounts reclassified from accumulated other comprehensive loss | 5.7 |  | 0.2 |  | 5.8 |
Balance at September 30, 2021 | $ | (48.9) |  | $ | (2.4) |  | $ | (51.3) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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