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Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2020
Accumulated Other Comprehensive Loss [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
| Postretirement Benefit Plans |  | Cumulative Translation Adjustment |  |  |  | Accumulated Other Comprehensive Loss
As of December 31, 2017 | $ | (137.6) |  |  | $ | (210.6) |  |  |  |  | $ | (348.2) |
Net change during period | 6.0 |  |  | (33.3) |  |  |  |  | (27.3) |
As of December 31, 2018 | (131.6) |  |  | (243.9) |  |  |  |  | (375.5) |
Net change during period | (1.7) |  |  | (8.1) |  |  |  |  | (9.8) |
As of December 31, 2019 | (133.3) |  |  | (252.0) |  |  |  |  | (385.3) |
Net change during period | 77.4 |  |  | 28.5 |  |  |  |  | 105.9 |
As of December 31, 2020 | $ | (55.9) |  |  | $ | (223.5) |  |  |  |  | $ | (279.4) |

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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://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=118930883&loc=SL7669686-108580 + Details
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