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Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2021
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):
| March 31, 2021 |  | December 31, 2020
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Amount
Sales order book | $ | 54.6 |  |  | $ | 33.0 |  |  | $ | 21.6 |  |  | $ | 54.6 |  |  | $ | 32.0 |  |  | $ | 22.6 |
Customer relationships | 68.9 |  |  | 29.8 |  |  | 39.1 |  |  | 68.9 |  |  | 28.7 |  |  | 40.2 |
Total | $ | 123.5 |  |  | $ | 62.8 |  |  | $ | 60.7 |  |  | $ | 123.5 |  |  | $ | 60.7 |  |  | $ | 62.8 |

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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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- References No definition available. + Details
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