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Note 1. Summary of Significant Accounting Policies Product Warranty (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019, 2018, and 2017 are as follows:
 
Year Ended December 31,
 
2019
 
2018
 
2017
 
(in millions)
Beginning balance
$
7.4

 
$
10.1

 
$
12.0

Warranty costs incurred
(3.8
)
 
(2.8
)
 
(4.8
)
Warranty originations and revisions
4.5

 
0.1

 
4.8

Warranty expirations
—

 
—

 
(1.9
)
Ending balance
$
8.1

 
$
7.4

 
$
10.1