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Note 1. Summary of Significant Accounting Policies Product Warranty (Tables)
12 Months Ended
Dec. 31, 2020
Guarantees and Product Warranties [Abstract]  
Schedule of Product Warranty Liability [Table Text Block] The changes in the accruals for warranties for the years ended December 31, 2020, 2019, and 2018 are as follows:
 Year Ended December 31,
202020192018
 (in millions)
Beginning balance$8.1 $7.4 $10.1 
Warranty costs incurred(2.1)(3.8)(2.8)
Warranty originations and revisions5.9 4.5 0.1 
Warranty expirations(0.2)— — 
Ending balance$11.7 $8.1 $7.4