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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Excess Reorganization Value [Table Text Block] | Intangible asset balances are as follows (in millions):
| December 31, 2020 |  | December 31, 2019
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Amount
Sales order book | $ | 54.6 |  |  | $ | 32.0 |  |  | $ | 22.6 |  |  | $ | 54.6 |  |  | $ | 29.9 |  |  | $ | 24.7 |
Customer relationships | 68.9 |  |  | 28.7 |  |  | 40.2 |  |  | 68.9 |  |  | 24.1 |  |  | 44.8 |
Total | $ | 123.5 |  |  | $ | 60.7 |  |  | $ | 62.8 |  |  | $ | 123.5 |  |  | $ | 54.0 |  |  | $ | 69.5 |

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- Definition Schedule of Intangible Assets and Excess Reorganization Value [Table Text Block] + References No definition available. + Details
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