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Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2021
Accumulated Other Comprehensive Loss [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The following table summarizes the changes within each component of accumulated other comprehensive loss.
| Postretirement Benefit Plans |  | Cumulative Translation Adjustment |  |  |  | Accumulated Other Comprehensive Loss
As of December 31, 2018 | $ | (131.6) |  |  | $ | (243.9) |  |  |  |  | (375.5) |
Net change in postretirement benefit plans, net of tax | (1.7) |  |  | — |  |  |  |  | (1.7) |
Net foreign currency translation adjustment | — |  |  | (8.1) |  |  |  |  | (8.1) |
As of December 31, 2019 | (133.3) |  |  | (252.0) |  |  |  |  | (385.3) |
Net change in postretirement benefit plans, net of tax | 77.4 |  |  | — |  |  |  |  | 77.4 |
Net foreign currency translation adjustment | — |  |  | 28.5 |  |  |  |  | 28.5 |
As of December 31, 2020 | (55.9) |  |  | (223.5) |  |  |  |  | (279.4) |
Net change in postretirement benefit plans, net of tax | 15.1 |  |  | — |  |  |  |  | 15.1 |
Net foreign currency translation adjustment | — |  |  | (57.0) |  |  |  |  | (57.0) |
As of December 31, 2021 | $ | (40.8) |  |  | $ | (280.5) |  |  |  |  | $ | (321.3) |

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- Definition Accumulated Other Comprehensive Loss [Abstract] + References No definition available. + Details
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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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