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Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss (Notes) | 12 Months Ended
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Dec. 31, 2020
Statement of Other Comprehensive Income [Abstract] |
Accumulated Other Comprehensive Loss [Text Block] | ACCUMULATED OTHER COMPREHENSIVE LOSS
| 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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