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Intangible Assets (Tables)
6 Months Ended
Jun. 30, 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):
June 30, 2021December 31, 2020
Gross Carrying AmountAccumulated AmortizationNet AmountGross Carrying AmountAccumulated AmortizationNet Amount
Sales order book$54.6 $33.4 $21.2 $54.6 $32.0 $22.6 
Customer relationships68.9 31.0 37.9 68.9 28.7 40.2 
Total$123.5 $64.4 $59.1 $123.5 $60.7 $62.8